Features:<br> <br> Stainless Steel Locking Ball Ensures Secure Fit. Sockets Snap-On Tightly & Won't Slip Off<br> 1/4-inch Hex Shank Prevents Stripping During High Speed Drill Operation<br> Super Strong Heat Treated Chrome Vanadium Steel for Normal & Impact<br> Use - Sandblasted Finish<br> Converts All Power Drills into Speedy Socket Drivers.<br> Applies to the screwdriver handle or electric<br> screwdriver tools (hexagonal hole or three jaw chuck can be) driven sleeve is used, can be the original hexagonal side after<br> installation on size into square size, which<br> can be used for the installation of the sleeve, is a good accessories to convert<br> <br> Specification: Size: inch L 1/4"*1/4"*50mm--1/4 "shank can be converted into 6.3 mm square 3/8"*1/4"*50mm--1/4 "shank can be converted into 10 mm square 1/2"*1/4"*50mm--1/4 "shank can be converted into 12.5 mm square Material:Chrome vanadium steel cr-v <br> Package Includes:<br> One 1/4" Drive Hex Shank Extension Bar<br> One 3/8" Drive Hex Shank Extension Bar<br> One 1/2" Drive Hex Shank Extension Bar<br>