TEKTON 7576 Screw Extractor Set, 5-pc. Removes Broken Screws, Bolts and Studs without Damaging Hole Threads 5-Piece Screw Extractor: 1/8-Inch-1/4-Inch; 1/4-Inch-5/16-Inch; 5/16-Inch-7/16-Inch; 7/16-Inch-9/16-Inch; 9/16-Inch-3/4-Inch Heat Treated High Carbon Steel Construction Corrosion-Resistant Finish Quality Guarantee