Flexible Cylinder Hone, Compatible Bore Diameter - Maximum 4 5/8 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.31 in, Abrasive Length 4 in, Overall Length 13 1/2 in, Abrasive Material Silicon Carbide, Grit 320, Compatible Tool Type CNC Machine, Drill, Drill Press, Operating Speed - Maximum 600 RPM, Primary Material Application Cast Iron, Steel, Stainless Steel, End Marking Color Not Applicable, Grade Extra Fine, Stem Marking Color Not Applicable WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov -