IRWIN Insert Bit,1/4",Torx,T15,PK10, 1838512

These power bits from TORX series are engineered for maximum durability and long life with impact drivers. These bits are forged rather than milled, so they fit fasteners more precisely. It reduces stripping and increases the life of the bit itself - Irwin's TORX impact Performance series bits have three times longer life than traditional bits. They are manufactured with heavy-duty, cold-forged, high-grade steel to withstand extremely high torque output. Plus, a black oxide finish resists corrosion and increases the life of the bit.