Milwaukee Shockwave Impact Duty Sockets are engineered for extreme durability and up to 10x life. Proprietary steel and heat treat process for maximum strength and durability. Thin wall construction for easy access in tight spaces. 6 point deep wells for unyielding bit engagement. Socket rail included Kit Includes sizes: 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16 and 3/4. 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.