- Turn your power drill or impact driver into versatile high-speed nut driver
- 3-size set has 1/4", 3/8" and 1/2"-drive anvils to work with all your sockets
- 1/4" hex shaft fits all quick-change adapters and extensions, drill chucks
- Spring-loaded stainless steel tension ball keeps sockets in place
- Hardened and treated chrome-vanadium steel alloy for superior strength and durability