Flexible Cylinder Hone, Compatible Bore Diameter - Maximum 20 mm, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.19 in, Abrasive Length 2 1/2 in, Overall Length 8 in, Abrasive Material Silicon Carbide, Grit 600, Compatible Tool Type CNC Machine, Drill, Drill Press, Operating Speed - Maximum 1,000 RPM, Primary Material Application Cast Iron, Steel, Stainless Steel, End Marking Color Not Applicable, Grade Fine, Stem Marking Color Not Applicable WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov -