Features and Benefits:Designed for use with Impact Drivers;Longer life with custom steel;Optimized Shockzone for added durability in Impact Drivers;Optimized with extreme durability for up to 50X life;The MILWAUKEE? SHOCKWAVE? 1/4 in. Hex to 1/2 in. Square Socket Adapter allows impact sockets to be used with impact drivers. The Milwaukee Impact Duty? socket adapters are made from a proprietary steel, heat treated to control hardness and provide durability with up to 50X life. The socket adapter has a heavy-duty construction for fastening capabilities in all impacts, built to withstand frequent use and save the expense of having to buy a separate drill driver. Milwaukee hex to square socket adapters are engineered for maximum durability and long-lasting use. This impact socket adapter is designed for use with impact drivers and impact sockets.