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Hey, it’s Mena.
Anyone who’s worked on-site long enough has cried over a stripped screw at least once. The moment a driver slips, the head crumbles, and there’s no way forward — whether or not you have an ENGINEER Nejisaw-Rus in your hand at that moment means the difference of an hour of work time.
ENGINEER is a precision tool specialist based in Osaka. The Nejisaw-Rus series has sold over 4.5 million units and is a long-running bestseller, widely supported by electricians, mechanical engineers, and electronics hobbyists alike. This article takes an in-depth, practical look at 10 ENGINEER precision tools, centered on the Nejisaw-Rus lineup for dealing with stripped screws.
メナENGINEER tools carry a reassuring sense of “they’ll really come through when you’re in trouble” across their entire lineup. I’ve been in countless situations where having a Nejisaw-Rus in hand was the deciding factor in whether a repair got finished or not.
【Nejisaw-Rus Series】Specialized Tools That Save Stripped Screws
The defining feature of the Nejisaw-Rus series is the vertical-groove serrated jaw at the tip. It bites into stripped screw heads and turns them even in situations where a regular plier would slip. With 3 different size models available, you can choose based on screw size and application.
1. ENGINEER Nejisaw-Rus GT PZ-58
メナAnyone who’s ever stripped a screw immediately understands the value of the Nejisaw-Rus GT. Covering Φ3–9.5mm, this single tool handles the vast majority of home appliance repairs and on-site equipment work.
| Manufacturer | ENGINEER |
| Model | PZ-58 |
| Screw diameter range | Φ3–9.5 mm |
| Overall length | 175 mm |
| Weight | 200 g |
| Jaw shape | Vertical-groove serrated |
The Nejisaw-Rus GT is ENGINEER’s flagship product and the core model of a series that has sold over 4.5 million units. The vertical-groove serrated jaw bites into stripped screw heads and turns them even in situations where a regular plier would slip. It covers screw diameters from Φ3 to 9.5mm, handling everything from home appliances and electronics to equipment maintenance and field work.
At 175mm long and 200g, the PZ-58 is a manageable size that fits right into a tool bag. If asked “Which Nejisaw-Rus would you choose as your only one?” the answer is the PZ-58 without hesitation. The “G” in GT stands for an improved grip version, making it more comfortable to hold than the previous model.
This is a universal tool that works across job types — home appliance repair, electronics work, and on-site equipment maintenance. If you’re buying your first Nejisaw-Rus, start with this model.
2. ENGINEER Nejisaw-Rus M2 PZ-57
メナDedicated to ultra-small diameters of Φ2–3.5mm. Anyone who has stripped a screw on a smartphone or watch knows that feeling — “a regular plier is useless here.” The PZ-57 directly solves that problem.
| Manufacturer | ENGINEER |
| Model | PZ-57 |
| Screw diameter range | Φ2–3.5 mm |
| Overall length | 140 mm |
| Feature | Anti-static design |
| Application | Precision instruments, electronic components |
The Nejisaw-Rus M2 is dedicated to the tiny screws found in smartphones, tablets, watches, and eyeglass frames. Specialized for ultra-small screw diameters of Φ2–3.5mm, it handles precision instrument screws that the GT cannot grip. The anti-static treatment reduces the risk of damaging electronic components.
The compact 140mm length excels in tight spaces such as smartphone disassembly and repair work. This is the tool for controlling force on a precision workbench. It suits precision equipment users who find the GT too large.
DIYers who have taken apart their own phones or watches will know firsthand why a dedicated tool of this size is essential. Pairing it with the GT lets you choose the right tool for each screw diameter.
3. ENGINEER Nejisaw-Rus RX PZ-59
メナThe PZ-59’s Φ15mm capacity is no joke. The wavy jaw bites deep into rusty automotive and motorcycle bolts and stuck machine screws — covering territory the GT simply cannot reach.
| Manufacturer | ENGINEER |
| Model | PZ-59 |
| Screw diameter range | Φ3–15 mm |
| Overall length | 200 mm |
| Weight | 310 g |
| Jaw shape | Wavy jaw |
The Nejisaw-Rus RX is the top-of-the-line model of the series. It handles Φ3–15mm screws and can deal with large bolts found in automobiles, motorcycles, and heavy machinery. The wavy jaw design bites deep even into oily or surface-damaged screws.
It serves as the last resort for large screws the GT cannot remove. At 200mm long and 310g — the largest in the series — it can apply more torque, expanding the range of situations it can handle. It’s worth having on hand for anyone in equipment maintenance or mechanical fields who regularly encounters screws that absolutely refuse to come out.
Particularly recommended for auto mechanics, mechanical engineers, and equipment maintenance personnel who work with large machinery. The GT and RX together cover everything from small to large screws.
【Precision Tool Series】Tools for Accurate Fine Work
ENGINEER offers more than just the Nejisaw-Rus — their specialized tools for precision instrument assembly and disassembly are equally impressive. Here’s the lineup for those who do detailed work like electronics, PC building, and watch repair.
4. ENGINEER Precision Screwdriver Set DM-20
メナThe difference between a cheap precision screwdriver and the DM-20 becomes clear from the first use — you can feel it in your hands. The high tip accuracy means less stripping, and your failure rate on precision work drops.
| Manufacturer | ENGINEER |
| Model | DM-20 |
| Contents | 6-piece set |
| Compatibility | Various precision Phillips and flathead sizes |
| Feature | High-precision tip, anti-strip |
| Application | Watches, cameras, eyeglasses, electronics |
The DM-20 is a 6-piece precision screwdriver set specialized for disassembling and assembling watches, cameras, eyeglass frames, and electronics. ENGINEER’s precision tools feature high-accuracy machined tips that fit precisely into small screw heads, dramatically reducing the “stripping the screw head” problem that often occurs with cheap screwdrivers.
The 6-piece set covers all precision Phillips and flathead sizes, so this single set handles most watches, cameras, smartphones, and electronics. Its compact size for storing a set in your toolbox is also well-regarded.
This set is the ideal entry point for anyone who has never bought precision screwdrivers before. Once you experience the difference in tip quality, you won’t be able to go back to cheap ones.
5. ENGINEER Precision Nut Driver Set DK-14
メナPC motherboard standoff nuts — if you tighten them by hand, how do you get them off next time? The DK-14 answers that question. It’s quietly essential for PC builders.
| Manufacturer | ENGINEER |
| Model | DK-14 |
| Contents | 4-piece set |
| Nut diameter range | Φ3–6 mm |
| Handle color | Green (high visibility) |
| Application | Hex nuts inside PCs and electronics |
The DK-14 is a driver set dedicated to the small hex nuts used inside PCs and electronics. Supporting hex nuts of Φ3–6mm, it is designed specifically for removing PC case standoff nuts and fastening nuts inside electronic devices.
The green handles offer high visibility, reducing the chance of dropping or losing them in tight spaces inside cases. The 4-piece set covers each size, making it a convenient set for anyone who frequently builds, modifies, or maintains PCs.
For PC builders and electronics modders, this is a “should-have” tool. It particularly hits home for anyone who has damaged a tool trying to remove a standoff nut without the right equipment.
6. ENGINEER Micro Nipper NS-03
メナAt 128mm, the size is perfect for circuit board work. Where a regular nipper is too large to fit, the NS-03 can cut precisely. It’s an indispensable tool for electronics work.
| Manufacturer | ENGINEER |
| Model | NS-03 |
| Overall length | 128 mm |
| Blade length | Approx. 11 mm |
| Compatible with | Wires and lead wires up to φ1.0 mm |
| Application | Cutting circuit board wiring and precision cables |
The NS-03 is a 128mm micro nipper specialized for cutting in electronics work and precision wiring. It excels at cutting lead wires on circuit boards, finishing thin wire connections, and forming component leads — anywhere precise cutting is needed.
The compact 128mm size is its biggest advantage. It reaches tight spots on circuit boards where a full-sized nipper is too large, allowing you to cut exactly the wire you need. The grip provides a secure hold, designed to reduce fatigue during extended work sessions.
This is a must-have for electronics hobbyists working with Arduino or Raspberry Pi, and for harness builders and electrical technicians. Switch from a regular nipper to this for precision cutting and you’ll notice the difference in your results.
【Other Popular Tools】ENGINEER’s Specialized Expertise
Beyond the Nejisaw-Rus and precision tools, ENGINEER offers niche specialty tools that solve real on-site problems. Here’s a look at the strippers and tweezers essential for wiring and electronics work.
7. ENGINEER Neji Bazooka DBZ-55B
メナIf the Nejisaw-Rus is “the hand tool for carefully removing one screw at a time,” the Neji Bazooka is “the tool for power-driving through a high volume of stripped screws on-site.” They serve different purposes — having both and using each appropriately is the right call.
| Manufacturer | ENGINEER |
| Model | DBZ-55B |
| Shank | Hex shank 6.35 mm (1/4″) |
| Bit length | 55 mm |
| Compatible tools | Electric drill, impact driver |
| Application | Power removal of stripped and rusted screws |
The Neji Bazooka DBZ-55B is a stripped-screw removal bit designed to be mounted on a drill or impact driver. Unlike the hand-tool Nejisaw-Rus, it can bite in while applying powered torque. The 1/4″ hex shank fits standard impact drivers.
When facing “a site full of stripped screws” or “heavily seized screws,” a powered approach is far more efficient than hand tools. This bit truly shines when processing not just one screw but tens of stripped screws at a time.
Well-suited for facility demolition and renovation sites, old machinery maintenance, and tasks requiring removal of large quantities of screws. On professional job sites, carrying both the Nejisaw-Rus (hand tool) and the Neji Bazooka for different situations is standard practice.
8. ENGINEER Multi Wire Stripper PAW-01
メナNo need to match wire gauge — just clamp and pull. Once you use this, you’ll never go back to the old-style stripper where you had to adjust the blade width. It genuinely changes how fast you work on electrician job sites.
| Manufacturer | ENGINEER |
| Model | PAW-01 |
| Wire diameter range | φ0.3–1.6 mm (AWG10–24 equivalent) |
| Feature | Automatic wire diameter adjustment |
| Application | Stripping insulated and control wires |
| Operation | One action (clamp and pull) |
The PAW-01 is a multi wire stripper with an automatic wire diameter adjustment mechanism. Its biggest feature is the one-action operation: “clamp any wire diameter and pull to strip the insulation.” It supports a wide range of wire diameters equivalent to AWG10–24.
Traditional fixed-blade strippers required blade adjustment for each wire size. The PAW-01 automates that adjustment, so you can work at full speed even on sites with a mix of different wire sizes. This directly reduces fatigue for electricians and maintenance workers who spend all day doing wiring work.
The comfort of not having to think about wire gauge each time is something you only understand after using it. If you do a lot of wiring work, this stripper is well worth the investment.
9. ENGINEER Wire Stripper for Ultra-Fine Wire PA-14
メナWhen wire is too fine for the PAW-01, it’s the PA-14’s turn. For circuit board wiring and fine harness lines, using these two tools interchangeably is the standard setup for professional electronics workers.
| Manufacturer | ENGINEER |
| Model | PA-14 |
| Wire diameter range | φ0.1–0.5 mm (AWG20–30 equivalent) |
| Feature | Ultra-fine wire dedicated, precision blade |
| Application | Circuit board wiring, harness fine wire stripping |
| Blade type | Fixed blade |
The PA-14 is a wire stripper dedicated to stripping ultra-fine wire insulation, such as circuit board wiring and thin harness lines in electronic devices. Designed for ultra-fine wire of AWG20–30 equivalent (φ0.1–0.5mm), it handles cases where general wire strippers are too large to use.
It’s an essential tool for electronics hobbyists, precision instrument repairers, and harness builders. The finer the wire, the harder stripping becomes, but the PA-14’s precision blade strips insulation cleanly without damaging the conductor. Well-suited for precision wiring work where finish quality directly affects reliability.
The best setup is to use it alongside the PAW-01 (automatic adjustment, AWG10–24) for different wire diameters: PAW-01 for thick wire, PA-14 for ultra-fine wire — together covering the full range.
10. ENGINEER Stainless Tweezer PT-12
メナThe need for non-magnetic tweezers becomes clear once you get burned by a magnetized cheap pair. That sensation of electronic components sticking to the tips and not letting go. The PT-12 is completely free of that stress.
| Manufacturer | ENGINEER |
| Model | PT-12 |
| Overall length | 160 mm |
| Weight | 28 g |
| Material | Non-magnetic stainless steel |
| Shape | Crane-neck type (tip angled 15 degrees) |
The PT-12 is a non-magnetic stainless steel tweezer. Its crane-neck shape with a 15-degree angled tip allows you to accurately hold small chip components and electronic parts on circuit boards. At 160mm long and 28g, it is lightweight and designed to reduce hand fatigue during extended precision work.
Being non-magnetic is its greatest feature. Inexpensive tweezers can become magnetized over time, causing electronic components and tools to stick to them. The PT-12, made of non-magnetic stainless steel, eliminates that concern. Well-suited for precision work where magnetism is a problem: soldering, circuit board repair, handling internal watch components.
At 160mm, it’s easy to maneuver and invaluable for soldering, board repair, and precision assembly. If you’ve struggled with components sticking to magnetized tips, switch to non-magnetic tweezers and see the difference.
How to Choose ENGINEER Tools | The Key Is Using the Right Tool for Each Job
When choosing ENGINEER tools, work backwards from “what problem am I trying to solve.” Here’s a guide organized by use case.
Want to remove stripped screws → Nejisaw-Rus Series
Choose from 3 models based on screw diameter. For small screws in home appliances and electronics, use the PZ-58 (GT) or PZ-57 (M2). For large screws in automobiles and heavy machinery, use the PZ-59 (RX). If choosing just one, the GT (PZ-58) is the most versatile starting point.
Want to assemble or disassemble precision devices → Precision Tool Series
For disassembling watches, cameras, PCs, and smartphones, get the DM-20 (precision screwdriver set) and DK-14 (nut driver set). For cutting circuit board wiring, use the NS-03 (micro nipper). If you’re getting seriously into precision devices, I recommend getting all three together.
Want to do wiring work and electronics → Strippers and Tweezers
For stripping thick wire (AWG10–24 equivalent), use the PAW-01 (multi wire stripper). For ultra-fine wire (AWG20–30 equivalent), use the PA-14 (ultra-fine wire). For holding precision components, use the PT-12 (stainless tweezer). Electronics workers who do it all should have all three — it takes your wiring work up a level.
Frequently Asked Questions
Q. Does the Nejisaw-Rus work on any screw?
A. It generally works on screws with exposed heads (countersunk, round-head, hex bolts, etc.). It may not grip screws that are countersunk flush with the surface. Within the supported screw diameter range, it works on standard Phillips, flathead, and hex screws.
Q. What is the difference between the Nejisaw-Rus GT, M2, and RX?
A. They differ in supported screw diameter. GT (PZ-58) handles Φ3–9.5mm and is the most versatile. M2 (PZ-57) handles Φ2–3.5mm and is dedicated to tiny screws in precision instruments. RX (PZ-59) handles Φ3–15mm and is the high-end model for large screws. The typical priority order is: start with one GT, add M2 if you also work on precision devices, add RX if you also work on heavy machinery and vehicles.
Q. How should I use the Neji Bazooka and Nejisaw-Rus differently?
A. The Nejisaw-Rus is for carefully removing screws one at a time by hand; the Neji Bazooka is for efficiently removing multiple screws using a power tool. For a small number of stripped screws, use the Nejisaw-Rus. For large quantities or heavily seized stripped screws, use the Neji Bazooka. Having both and using each appropriately is standard on professional job sites.
Q. How should I use the PAW-01 and PA-14 differently?
A. They differ in supported wire diameter. The PAW-01 is for automatic stripping of general wires in the AWG10–24 range (thicker). The PA-14 is for precision wiring in the AWG20–30 range (ultra-fine). For general electrical and wiring work, the PAW-01 is the main tool. For electronics work and precision instrument repair, use the PA-14.
Summary | ENGINEER Tools: Specialized Tools You Can Rely on “When It Really Matters”
ENGINEER tools are consistently designed to directly solve problems. The Nejisaw-Rus is the direct answer to stripped screws. The precision tools are purpose-built for safely handling precision instruments. The strippers mechanize wiring work for efficiency. None of these are “vaguely good tools” — they are all products specialized for specific challenges.
Whether you’re an electrician, mechanical engineer, electronics hobbyist, or DIYer, if you do work that demands precision, this is a brand worth experiencing at least once. In particular, having just one Nejisaw-Rus GT (PZ-58) in your toolbox can save you from hitting a dead end on a job.
メナMany ENGINEER tools have the quality of “not used often, but absolutely necessary when the moment comes.” Just having them changes your peace of mind. They’re a high-value investment as tools.
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