General description This Stud Extractor Set includes 6 pieces of screw extractors designed for removing damaged, rusted, or stripped screws, bolts, fasteners, and more. The extractors feature a left-handed spiral flute for enhanced gripping power, making them effective for various applications. Technical specifications Extractor Sizes: 4.0mm, 4.5mm, 6.5mm, 7.5mm, 11.0mm, 15.0mm Recommended Extraction Diameters: 4-6mm, 6-8mm, 8-11mm, 11-14mm, 14-18mm, 18-25mm Material: High-quality GCR15 tool steel Usage Drill a hole in the center of the broken screw using a suitable drill bit. Use the appropriate extractor to remove the screw. For larger extractors, an adjustable wrench can be used to hold the extractor firmly. Can also be used for drilling holes in wood, metal, plastic, brick, and walls. Other information When using power tools, wear protective eyewear and clothing. Diameters of drill bits and recommended extraction diameters are engraved on the case.