Spiral Flute Screw Extractors 535 524 Series Set, 6 Piece, 3 32 in to 7 8 in no checkout Strong frame and rugged design Options Strong frame and rugged design Options available for flat file with round cup design room temperature vulcanizing gasketing compound designed to provide reliable “formed in place” gaskets for mechanical assemblies Cures on exposure to moisture in the air to form a tough 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 the extractor's grip increases Extractor size and recommended drill bit size are etched on each tool