General description This 10pcs Multi-Flute Hex Head Screw Extractor Set is specifically designed to effectively remove broken nails and bolts, making it an essential tool for any DIY enthusiast or professional. Technical specifications Material: High quality chrome vanadium steel Heat treatment processed for enhanced hardness and wear resistance Extractor sizes: 3.2mm to 10.3mm Usage Reverse spiral design for maximum grip Engraved recommended drill bit size for location hole on each extractor Suitable for high torque applications