Shockwave Nutdriver Set Milwaukee® SHOCKWAVE Impact Duty™ Insert Magnetic Nut Drivers are engineered for extreme durability. 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. Contains sizes 1/4", 5/16", 3/8", 7/16", and 1/2".