Milwaukee® SHOCKWAVE Impact Duty™ Insert Magnetic Nut Drivers are engineered for extreme durability and up to 30x 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. 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.