Irwin Impact Performance Series fastener drive bits are engineered for maximum durability and long life with impact drivers. These bits fit fasteners more precisely, which reduces stripping and increases the life of the bit itself. Irwin Impact Performance Series bits have three times longer life than traditional bits. Manufactured with heavy-duty, cold-forged, high-grade steel, they'll withstand extremely high torque output. They're designed with a 1/4 quick-change shank, so they work with all types of impact and rotary drivers.