The originality of this tool is that you can work with him with one hand. Dignity, which is quite appreciated by homebrew: there are plenty of places where conventional two-handed drill unfold. Replacing the drill bit on the screwdriver tip, you can get a screwdriver-bitreverse. The case of drills made of a conventional clamp: it only had to weld the handle and drill out the threaded hole. The drive arm is curved from steel sheet of thickness 1,5 mm. Bevel gears are the same as for conventional drills.