Makita Impact Rated Bit T40 x 25mm (2 Pack) in Black. 1/4" hex shank with Torsion zone. For Use With Impact Drivers. Black Coating Prevents Rusting. High Durability With Longer Life Than Standard Bits. Makita Impact Black bits are designed to withstand high torque when used with Impact Drivers. They are constructed from high strength, heat-treated S2 special steel. The black coating is to prevent rust. With precision-made tips to ensure a perfect hold. Up to 20% more durable than a standard bits. Shank C form. 1/4” hex shank. Size: T40. Length: 25mm. Quantity: 2.