Irwin 53535 Hanson 5-Piece Spiral Flute Screw Extractor Set (EX-1 to EX-5) Designed to remove broken studs, bolts, socket screws and fittings Aggressive left hand spiral design for extra gripping power Spiral flutes are designed to embed themselves deeper into the metal as you turn the tool Extractor size and recommended drill bit size are etched on each tool Set Includes EX1, EX2, EX3, EX4 and EX5 Spiral Flute Screw Extractors