1. 6.35mm shank diameter, wide range of applications, compatible with various drill bits/screwdriver bits 2. Built-in strong magnet, automatic locking design, easy to change bits 3. Built-in stable lock and high-efficiency spring, high concentricity 4. Applications: for quick adapters to electric drills, screwdrivers, pneumatic screwdrivers, etc. 5. Size: about 6 x 2.4cm, shank diameter about 6.35mm
