High Quality Material: Our screw drill bit is made of high quality carbon steel. It has proper hardness and twist which makes the bits not easy to break and wear. Great function: It is suitable for drill, screwdriver, batch head and others to transfer. The head of the screwdriver can jam the connecting rod. It is ideal for exchanging sleeve and gasket, extending connecting rod. Great function: It is suitable for drill, screwdriver, batch head and others to transfer. The head of the screwdriver can jam the connecting rod. It is ideal for exchanging the sleeve and gasket, extending the connecting rod. Great function: It is suitable for drill, screwdriver, batch head and others to transfer. The head of the screwdriver can jam the connecting rod. It's great for swapping the sleeve and gasket, extending the connecting rod. Quick Fix: Our screw drill tip holds screws snugly without fear of falling off for easier and more convenient installation, improves greatly the work efficiency.