Features and Benefits:?Designed for use with Milwaukee? SHOCKWAVE? magnetic bit holders.?Strong magnet for secure grip.?Color-coded band for easy size identification.?Custom Alloy76? steel.Milwaukee? SHOCKWAVE? Impact Duty? insert magnetic nut drivers are engineered to be more durable delivering up to 30x life. Made from our Custom Alloy76?, 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 holders 2.36 in., 3 in., 6 in., 12 in., 30? knuckle? pivoting bit holder and all bit tip holders.