Ansen Tools AN-174 Heavy Duty Extractor Set, 7-Piece Extractions made from heat treated alloy steel Sizes include No.1: 1/8-Inch to 1/4-Inch, No.2: 1/4-Inch to 5/16-Inch Extracts screws, studs and bolts Heat treated adjustable high-carbon steel handle Extractors tempered for maximum toughness