Milwaukee® SHOCKWAVE Impact Duty™ Driver Bits and Bit Holders are engineered for extreme durability and up to 10x life. Made from proprietary steel and heat treated to control hardness, the Shockwave Impact Duty™ Driver 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. BONUS Milwaukee® SHOCKWAVE Magnetic Bit Tip Holder 2.36" included. The SHOCKWAVE Impact Duty™ Magnetic Bit Holders are made from proprietary steel and heat treated to control hardness and feature a powerful magnet allowing for a secure grip and unyielding bit engagement. The 2-piece construction of the holders is the optimal assembly for abusive applications. Now use with Milwaukee® SHOCKWAVE Impact Duty™ Insert Magnetic Nut Drivers (1/4", 5/16", 3/8", 7/16", 1/2").