75/100/150/300mm Multiple Sizes 1/4Inch Hex Quick Release Electric Screwdriver Extension Bit Holder Drill Bit Rod Bar Hand Tools

[Features]: 1. The product interface has a locking mechanism, suitable for electric drill, electric driver, wind batch and other adapter extension. 2. Suitable for 1/4 (6.3mm) hexagonal shank batch head, screwdriver head, drill bit extension use. 3. Fast, tightening, greatly improve work efficiency. 4. Style A is non-mangnetic,it has three marbles inside the interface that holds the drill bit in place, preventing it from falling off. 5. Style B is non-mangnetic, it has a marble inside the interface that holds the drill bit in place, preventing it from falling off. 6.Style C is non-mangnetic, and there are two marbles and a spring in the interface to fix the drill bit and prevent it from falling off. [Material]: Carbon Steel [Shank size]: 1/4 "(6.35mm) hexagonal shank