1、The kit contains 6 different sizes of screw extractors, suitable for different broken screw extraction situations. 2、Used to quickly and easily pull out broken screws, pipes and bolts that cannot be removed with a standard screwdriver. 3、Using coarse‑tooth left‑rotating thread design, strong pulling force, not easy to fall off. 4、Made of high‑quality high‑speed steel material, hardness reaches HRC‑60-63, good abrasion resistance. 5、Equipped with a plastic box, it is convenient to store and maintain these screw extractors. Item Type: Screw Remover Material: High speed steel Purpose: Take out broken screws Application Scope: 1/8-1/4in (M3-M6)1/4-5/16in (M6-M8) 5/16-7/16in (M8-M11) 7/16-9/16in (M11-M14) 9/16-3/4in (M14-M18) 3/4-1in (M18-M25) How to Use: 1. Choose a rotor that is thinner than the broken screw, and drill a deep enough hole in the middle of the broken screw with an electric drill. 2. Choose an extractor the same size as the drill bit diameter, put it in the hole, and rotate it with the wrench. 3. Use the extractor to screw in the broken screw counterclockwise until the broken screw is unscrewed. 6 x Screw Remover 1 x Storage Box