Features and Benefits:�Designed for use with Milwaukee SHOCKWAVE™ magnetic bit tip holders�Strong magnetic for secure grip�Color-coded band for easy size identification�The Milwaukee 49-66-4512 contains 3 nut driversThe Milwaukee 49-66-4515 3/8 in. 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° knuckle™ pivoting bit holder and all bit tip holders. The pack contains 3 nut drivers.