MILWAUKEE SHOCKWAVE Impact Duty Sockets are engineered for extreme durability and up to 10x 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. This kit also has a 1/4" Hex to 1/4" Square SHOCKWAVE Impact Duty Socket Adapter provide fastening capabilities with all impacts.