3pc Extra-Long 6" Impact Power Extension Bar Set - 1/4", 3/8", 1/2" 3pc 6" impact power extension bar set - 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 - Each extension bar is 6" to provide double the reach of ordinary power extension bars 1/4" hex shaft fits all quick-change adapters & extensions, drill chucks Spring-loaded stainless steel tension ball keeps sockets in place Hardened & treated Chrome-Vanadium steel alloy with anti-rust finish for superior strength & durability