Makita Impact Black Torsion magnetic 1/4" Hex Shank Nutsetter. For Use With Impact Drivers. Black Coating Prevents Rusting. High Durability With Longer Life Than Standard Bits. (10mm x 50mm). This nutsetter is designed for high torque applications with impact drivers. It is constructed from high strength, heat-treated S2 special steel for durability and has precision-made tips for a secure fit. The black coating helps prevent rust and offers up to 20% more durability than standard bits. It features a magnet for fastener retention and is suitable for driving hex nuts or hexagon head fasteners.