Material: Alloy Steel High Quality Material: Our screw drill bit is made of high quality alloy steel. It has proper hardness and twist which makes the bits difficult to break and wear. Highly effective drilling/screwing aid: You can work in a 20 angle or use it as a normal bit holder to properly fulfill your purpose. The built-in magnet to hold the bit is very strong to hold the bit and the screw. Small but thin bit holderThe length of the swivel bit holder is 87mm, the diameter of the hex shank is 6.35mm. The swivel bit holder is made of high quality alloy steel, high hardness, not easy to rust, strong and durable. Quick Fix: Our screw drill bit sticks tightly to screws without fear of falling off for more installation easy and more convenient, greatly improve work efficiency. Great function: It is suitable for drill, screwdriver, batch head and others to transfer. The head of the screwdriver can jam the connecting rod. This is ideal for exchanging the sleeve and gasket, extending the connecting rod. High compatibility bit holder: Our bit holder kit is suitable for electric screwdriver, manual screwdriver, electric drill, pneumatic drill, etc. Used for building decks, wooden frames, plywood floors, building crates, etc. Scope of delivery: One piece