The drill head has strong magnetism, so it can block the connecting rod itself. Solid, permanent magnet bits in safe place Accepts all hex shank drills. Hexagonal shank chucks firmly in drilling machines. Holder all my downstream bits without any problems, also the inside of the magnet is strong enough, so that the bits are not lost and even the magnetic force is transferred to screws and the like. Universal 1 or 4 "Quick Change Hex The legs fit all wires, 1 or 4" blast leads and hand drivers so you can bring your bit extensions anywhere to get a job done, no matter what. type of drill bit or driver your disposal. It can connect electric, screwdriver, screwdriver nozzle, screwdriver head. It applies to the replacement of the sleeve and the joint, the extension of the connecting rod. High hardness, anti-slip, large torque, long life and durable. High feasibility, it can change six external angles into six internal angles. See more details.