The Makita B-63719 PH1 50mm Impact Black Bit is coated in manganese phosphate for wear resistance and to prevent rusting and corrosion for longer life. Impact Black Bits absorb hard impacts when screwing screws or when placing the screw head on the surface and the torsion zone counteracts high torque peaks. A screw guide helps to keep the screw perfectly positioned as they are driven into the material ideal for fitting hinges. Impact Black Bits are suitable for various applications inlcuding screwdriving cabinet making joinery assembly fixings and more.