It is used for fine screws such as glasses and watches.
On 2017-05-14 14:48:35
I purchased it to tighten the screws because the screws of the glasses were loose. There are five plus and minus from small to large respectively, I am glad that it can be conveniently used according to the size of the screw. I am also using it for back cover opening of the battery exchange of the wrist watch, but it is very useful and useful.
Plus is 5 stages, minus 6 stages size is one set, it is easy to use. Especially recent precision electric appliances are many plus screws, size is getting mixed, we are saved to plenty variety of places.