Milwaukee 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. Includes 1 each: 1/4", 5/16", 3/8", 7/16", 1/2" insert magnetic nut drivers (Standard with C-Ring). No. 49-66-4563: Pieces In Set: 5 pcs, Pkg Qty: 5, Package Type: Clamshell