Irwin Tools 1837379 Impact Performance Series Insert Square Drive Bit #1 (2 Pack) These drill bits are built for maximum durability and long life with impact drivers Each drill bit is manufactured with heavy-duty, cold-forged, high-grade steel The screwdriver bits can withstand high-torque output Precision-tip geometry on the insert bits delivers superior fitment with reduced stripping and cam-out A black oxide finish resists corrosion to help increase the life of each insert bit