General description This 6 Pieces Damaged Screw Extractor set is designed to easily remove stripped, painted, rusted, or rounded screws and bolts. Made from high-speed alloy steel (HSS 4341), it offers exceptional durability and a hardness rating of over 55 HRC. Technical specifications Material: HSS 4341 Steel Hardness: Over 55 HRC Diameter Range: 2-12 mm Usage Drill a deep hole in the screw head using a standard drill. Turn the screw extractor counterclockwise into the damaged screw to remove it. More convenient than using a double-sided screwdriver, as it eliminates the need to switch tools. Other information Package includes 5 stripped screw extractors in different sizes, stored in a black storage box. Suitable for most common drill bits and applicable for screws or bolts of various sizes.