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 inNvatively 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 in. 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. Nw use with Milwaukee SHOCKWAVE Impact Duty insert magnetic nut drivers (1/4 in., 5/16 in., 3/8 in., 7/16 in., 1/2 in.).