Milwaukee® SHOCKWAVE Impact Duty™ Insert Magnetic Nut Drivers are engineered for extreme durability and up to 10x life. Made from proprietary steel and heat treated to control hardness, the SHOCKWAVE™ Impact Duty Magnetic Nut Drivers feature a powerful magnet allowing for a secure grip and unyielding bit engagement. The bits feature color-coded rings for quick and easy size identification and a chamfered edge to allow for fastening in tight spaces.  Designed for use with Milwaukee® SHOCKWAVE Magnetic Bit Tip Holders 2.36", 3", 6", 12", 30° Knuckle™ Pivoting Bit Holder and all bit tip holders.