TDC® Greenfield® Chicago-Latrobe® Screw Extractor, Size: #6, List Number: 800, 3/8" Small End Diameter, Large End Diameter: 0.5938", 3-3/4" Overall Length, 1-3/4" Flute Length, Screw/Stud Size: 3/4 to 1", Drill Size: 13/32", 3/8" Pipe Size, Material: Alloy Steel, Finish: Bright, Applicable Materials: Alloy Steel, Tool Steel, Low and Medium Carbon Steel, Cast Iron