The RYOBI 3 PC. Spiral Screw Extractor Set is the perfect solution for easily removing stripped screws and bolts. With a durable steel composure and black oxide threads, these screw extractors are equipped to handle tough applications. The package features a sizing guide for assistance in picking the correct screw extractor and drill bit size for your application. In addition to your screw extractors, you will also need a drill with drill bits, hammer, pliers/wrench and oil. To use, simply add oil to the head of the stripped screw or bolt, drill with a drill bit, tap in the extractor and remove the stripped screw or bolt with pliers or a wrench by rotating counterclockwise. Included in the package are (3) Spiral Screw Extractors.