Milwaukee Shockwave Impact Duty deep well sockets are engineered for extreme durability and up to 10 times the life. Made from proprietary steel and heat-treated to control hardness, the Shockwave Impact Duty sockets feature thin wall construction for access in tight spaces and 6-point deep wells for unyielding bit engagement. 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. Set includes: 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", and 3/4" deep well sockets and socket rail. No. 49-66-4419: Drive Size: 3/8 In., Pieces In Set: 8 pcs, Finish: Black Oxide, Pkg Qty: 8, Package Type: Clamshell