Generic Hex Drive Power Drill Socket Extension Bit Adaptor Set - Pack of 3 Pieces Description:  Stainless Steel Locking Ball Ensures Secure Fit. Sockets Snap-On Tightly & Won't Slip Off 1/4-inch Hex Shank Prevents Stripping During High Speed Drill Operation Super Strong Heat Treated Chrome Vanadium Steel for Normal & Impact Use - Sandblasted Finish Converts All Power Drills into Speedy Socket Drivers. Applies to the screwdriver handle or electric screwdriver tools (hexagonal hole or three jaw chuck can be) driven sleeve is used, can be the original hexagonal side after installation on size into square size, which can be used for the installation of the sleeve, is a good accessories to convert Material:Chrome vanadium steel cr-v ? ? 1/4"*1/4"*50mm(Length)--1/4 "shank can be converted into 6.35 mm square 3/8"*1/4"*50mm(Length)---1/4 "shank can be converted into 9.53 mm square 1/2"*1/4"*50mm(Length)---1/4 "shank can be converted into 12.7 mm square? ? ? ? ? ? ? ? ? ? ? ? ? ? ??   ?  Package include  1X Socket Adapter Hex Shank set(3 pcs a set)