1. With a middle hole, suitable for core flower-shaped screws 2. The hexagonal opposite side diameter is 6.35mm (1/4), suitable for tools such as air screwdrivers, chuck electric drills, etc. 3. Made of S2 material, overall quenching and forging 4. With magnetic design, easy to use 5. Material: S2 6. Specifications: T6/7/8/9/10/15/20/25/27/30/40 7. Handle opposite side: 6.35mm 8. Length: about 50/75mm
