This WorkPro 3 piece Socket Adaptor Set ideally the set is used with impact drivers and sockets, these adapters work on three different drive sizes of standard and deep sockets (1/4 -inch 3/8 -inch and 1/2 -inch drives).The set quickly converts any power drill or 1/4 -inch impact driver into a socket driver to quickly tighten or remove fasteners.Drive Impact Driver Socket Adapter Set to your DIY or professional toolbox. It concluds three sizes of 1/2", 3/8" and 1/4" . For strength and durability, they are made of heat-treated CR-V steel for corrosion resistance. This set is perfect for your impact driver or drill, and allows you to replace your ratchet with a power tool.