Irwin Tools 1838501 Accessories, Insert Bit Impact T15 x 1" (Pack of 25) These insert bits are built for maximum durability and long life with impact drivers Each screwdriver bit is manufactured with heavy-duty, cold-forged, high-grade steel These 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