Makita is the leading manufacturer of professional power tools on the market. All Impact Black Nutsetter are magnetic, 50mm in length with a 1/4" hex shank, for use with Impact Drivers. The black coating prevents rusting, for longer life and is up to 20 per cent more durable than a standard screw bit. The B66830 is ideal for driving hex head nut and screws in a wide variety of applications.