[Use skills]: Take out the appropriate size of the screw extractor and install it on the electric drill, use the drill bits to drill the screw (appropriate depth), replace the other end to drill to a specific depth, then turn and extract. . It unscrews easily [Use skills]: Take out the damaged screw extractor of the appropriate size and install it on the electric drill, drill the screw with a drill (appropriate depth), change the other end to drill to a specific depth, then rotate it. the opposite direction to remove the damaged screw [Wide Use] Suitable for removing all kinds of damaged bolts, such as sliding bolts, broken bolts, rusty bolts and stuck bolts. It is a suitable choice for carpenters, masons and handymen. [Size] contains 5 different specifications of the professional screw extractor set, which is very convenient for handling different types of screws. Precautions before buying Please read the following content before To buy: 1. Flip the opposite direction when removing. Must be used with electric drill or hand drill. The speed should be slow, not too fast. 2. If the surface of the screw is smooth, you need to use it first. Drill holes in the small end or it will slip.