Milwaukee® SHOCKWAVE™ Impact Duty™ Insert Bits are engineered for extreme durability and upto 10X life. Made from proprietary steel and heat treated to control hardness, the SHOCKWAVE™ Impact Duty™ insert bits feature an innovatively designed geometric shock absorption zone to extend life. The forged tip allows for a secure grip and maximum contact eliminating stripping or slipping. Milwaukee® SHOCKWAVE™ Insert Bit Kit, 7 Piece, Steel