This nut driver is designed to tighten or loosen nuts, bolts, hooks quickly and efficiently when installing roller shutters/panels or other projects, and saves you a lot of time and hassle. your job faster. Just pop it into a power screwdriver and install the nut or flaps without worrying about thumb sprains using other tools, saving wear and tear on your fingers. This steel screwdriver is a perfect tool that works with any power drill (1/4 / 6mm hex shank). The total length of the tool is approximately 65mm; the outer diameter of the socket is about 17.8 mm; and the cut is 4mm wide. This small screwdriver is made of CR-V steel, which is very strong and sturdy.