Features: 100% Brand New and High Quality. Compact and easy to carry. Made of super strong heat treated chrome vanadium steel. Stainless steel locking ball ensures secure fit, won't slip off. Prevents stripping during high speed drill operation. Applies to the screwdriver handle or electric screwdriver tools (eg. hexagonal hole or three jaw chuck ). Can be used to install the sleeve , a good convert accessories. Specifications: Model Number: Socket Adapter Hex Shank Set Material: Chrome vanadium steel CR-V Net Weight: 67g Size: 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 included: 1 x Socket Adapter Hex Shank Set (3 PCS)