Does it lock in the off position so you can use it to initially break a screw loose and then spin it out with power? How does that work?

No it doesn't. The gear train between the motor and the screwdriver shaft is a high reduction setup. I.e. the motor turns fast and the shaft turns slowly. Trying to twist the the screwdriver bit in either direct can be done but is fairly difficult as you are trying to spin a reduction gear in the opposite direction. In other words, trying to spin the motor and the gears at high speed meets with serious resistance. It's OK for little screws, tho', up to M3/6BA.

Does this now use 4mm bits?

I received mine today, and measured the bits. They are 4mm not 1/8". I not that Tekton precision bits will fit, because I have those also and tried them. I believe all of the precision bit sets I have bought, within the past year or so, are 4mm so they are all interchangeable.

does this have an adaptor that goes with it ? How do you keep it charged

This tool uses two AA batteries. I do use Rechargeable batteries .

Is the thumb switch "trigger" variable speed? Or is it either on or off? Does it actually click on or you let go of it, will it return to off pos.

No, it is only one speed with a pretty good torque however it will not strip the screws. The switch is either on or off and must be held for forward or reverse directions. Keep in mind that this tool will fit the "abcGoodefg® 45 in 1 42 Tip Precision Magnetic Bit Screwdriver Set With Extension Bar". Hope it works for you as it has for me.

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Cordless Power Precision Screwdriver (500)

Product ID: 47955491

Details

Brand
General Tools
Number of items
1
Head style
Torx Phillips
Material
Plastic Rubber
Colour
Black/Gray

⚡100+ RPM Super-Torque drive

🔋Battery-powered cordless freedom

🔧6 versatile precision bits included

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HK$445

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In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔩 Screw Smarter, Not Harder — Power Precision in Your Palm!

BIT VERSATILITY - Comes with 6 essential bits (Phillips, Slotted, Torx) plus a quick-change chuck compatible with all 4mm micro bits.
TECH READY TOOL - Ideal for electronics, computers, and industrial applications—join the elite who never compromise on precision.
ERGONOMIC COMFORT - Designed with a rubberized handle for a secure grip during extended use—perfect for pros on the move.
ULTIMATE PORTABILITY - Cordless design powered by included AAA batteries—work anywhere, anytime without cords.
POWER MEETS PRECISION - Super-Torque motor delivers 100+ RPM for fast, accurate screwdriving in tight spaces.

The General Tools Cordless Power Precision Screwdriver (500) is a compact, battery-powered tool engineered for professionals and tech enthusiasts. Featuring a high-torque motor delivering over 100 RPM, it effortlessly handles tiny screws in confined spaces. Equipped with six popular precision bits and a quick-change chuck compatible with all micro bits, it offers unmatched versatility. Its ergonomic design ensures comfort during prolonged use, making it the go-to screwdriver for electronics, computer repairs, and industrial tasks.

Specifications

Manufacturer	General Tools
Part Number	500
Product Dimensions	2.87 x 13.97 x 28.58 cm; 1.36 g
Batteries	2 AAA batteries required. (included)
Item model number	500
Size	1 Pack
Colour	Black/Gray
Style	Cordless Screwdriver
Material	Plastic Rubber
Power Source	Battery Powered
Voltage	1.5 Volts (DC)
Item Package Quantity	1
Head Style	Torx, Phillips, Slotted
Certification	No
Special Features	Electric
Included Components	bare-tool; attachments
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Item Weight	1.36 g

Reviews

J**W

Stripped the gearbox and died in days

When I got this I was very pleased with how useful it was for tightening screws in terminal blocks quickly. The torque and speed were good. The build quality outside seemed pretty good, and it just worked. I even showed it off to friends and co-workers proudly as a punt that worked out. It didn't come with many bits, but I already had a 4mm hex bit set, so I was happy to not pay for another set.However, I was decidedly less chuffed when the the tiny tiny reduction drive on the front of the motor stripped a gear after a few days and it became totally useless. Returned for a refund - the design is not fit for purpose, no point to get it replaced.Avoid this item, you'll just have to return it in a week's time!

25.08.2018

M**R

A really useful tool

This is a really useful and handy tool, kept near me and not in the tool box. So I can use it on the little jobs like electric plugs, changing batteries without having to get the tool box out.. a must have tool.

6.01.2021

J**Y

nice idea and the concept has great potential but this ...

nice idea and the concept has great potential but this tool doesn't perform in my opinion. It turns too slow and the torque is really low which is possibly just as well as the driver bits are made of very soft metal. The flat bit has already twisted and it all feels very cheep in my hand. disappointed in this instance though for very light work it may be suitable... laptop repairs.. even still the speed it turns may prove frustrating. 2 stars.

11.05.2015

T**M

Quick delivery. Small tool that does the job

Needed an electrical screwdriver for work and my colleague bought this. It was good so I got one too.Quick delivery, works with 2 small batteries, does the job nicely

8.08.2018

D**N

quallity

useful tool for what I want plus drill chuck from Micro Mark

5.07.2019

H**S

powerful

powerful and has good solid attachments

28.02.2020

A**R

Value for money

31.08.2019

M**N

Five Stars

Excellent.

28.11.2017

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TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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