1.Professional Tools: This set of screw extractors will quickly and easily remove damaged screws, pipes, bolts and studs. 2.Scope of Application: This set of screw extractors can quickly and easily remove damaged screws, pipes, bolts and studs. Suitable for correcting pipe threads. Very suitable for home use and professional technicians, long service life. 3.Material: These screw extractors are made of carbon steel and can drill holes in most screws. Long-lasting and durable. Some drill bits can also be used to drill holes in wood, metal, plastic, bricks and walls. 4.Easy to Use: First drill a hole in the center of the broken screw with a suitable drill bit, and then use a suitable puller to extract the screw. The recommended drilling diameter and extraction diameter of the broken screw are printed on the housing. 5.How to Use: You can use the faucet handle to hold the extractor firmly; for large pullers, you can use an adjustable wrench. When removing the screw, you can use an adjustable wrench to hold the extractor firmly. Please wear goggles and protective clothing when using near power tools.