Features and Benefits:?Custom Alloy76? Steel is engineered to extend life?Strong magnetic tip for fastener retention?Color-coded band for easy size identification?Provides up to 30X life?Designed for heavy-duty impact applications?Designed for use with Impact Drivers and Drill DriversMilwaukee? SHOCKWAVE? Impact Duty? 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. 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.