TDC® Greenfield® Chicago-Latrobe® Screw Extractor, Size: #8, List Number: 800, 3/4" Small End Diameter, Large End Diameter: 1.0312", 4-3/8" Overall Length, 2-1/4" Flute Length, Screw/Stud Size: 1-3/8 to 1-3/4", Drill Size: 13/16", Material: Alloy Steel, Finish: Bright, Applicable Materials: Alloy Steel, Tool Steel, Low and Medium Carbon Steel, Cast Iron