Features: 1. Each has been quenching heat treated ,sturdy and wear resistant. 2. 1/4 " handle is suitable for all quick - change chuck and standard drill chuck. 3. These shock resistant adapters can meet the most demanding applications. 4. Adopting chrome vanadium steel material, the socket adapter is of high harness, strong strength and long durability. 5. Suitable for a screwdriver or electric screwdriver handle tools (hex hole or three jaw chuck) drive socket, can be used to install the socket, is a good accessories. Specification: Condition: 100% Brand New Item Type: Socket Bit Adapter Material: Chrome Vanadium Steel CR-V Size: 1/2" 1/4" 3/8" Package List: 8 * Socket Bit Adapter Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.