Milwaukee® SHOCKWAVE Impact Duty™;;; 4 piece Magnetic Nut Drivers are engineered for extreme durability and up to 10x life. These nut drivers are made with proprietary steel and heat treated to control hardnessand feature a powerful magnet allowing for a secure grip and unyielding bit engagement. These bits feature color-coded rings for quick and easy size identification and a chamfered edge to allow for fastening in tight spaces. Broadly targeting cordless users, the SHOCKWAVE Impact Duty™;;; accessory line is not only ideal for heavy duty impact applications, but delivers a full system solution for all the user's drilling and fastening needs.