Dsloger 1/4in Impact Drive Shank Quick Change Holder Hex Bit Drill Chuck Adapter Hot 100% brand new and noble quality. Suitable for electric drill, screwdriver, wind batch transfer using to play the role of releasing bit holder. Can be used for prolonging different kinds of screwdrivers. The interface has a locking function: it will be self locked while a drill bit connect to it, grip the black chuck by your one hand and push the hex shank by your another hand, then the connecting drill bit can be pulled out. Built in magnetic, fast, fastening, greatly improve work efficiency.