The drill head has strong magnetism, so it can jam the connecting rod itself. Strong, permanent magnetmaintains bits in safe place; Accepts all hex shank drill bits. Firm hex shank chucks in drilling machines. Holder all my downstream bits without any problems, also the inside of the magnet is strong enough, so the bits are not lost and even the magnetic force is transferred to the screws and the like.Universal 1/4" Quick Change Hex Legs fit all threads, 1/4" blow drivers and hand drivers so you can bring your bit extensions anywhere to get a job done, no matter the type of drill bit or driver at your disposal.It can connect electric, screwdriver, screwdriver beak, screwdriver head. It applies to replacement of bushing and joint, extension of connecting rod.High hardness, anti-slip, large torque, long life and durable.Strong feasibility, it can change six external angles into six internal angles.