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 in, 3 in, 6 in, 12 in, 30 deg Knuckle™ pivoting bit holder and all bit tip holders.