Flexible Cylinder Hone, Compatible Bore Diameter - Maximum 7 1/2 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.42 in, Abrasive Length 7 in, Overall Length 17 1/2 in, Abrasive Material Aluminum Oxide, Grit 120, Operating Speed - Maximum 600 RPM, Primary Material Application Stainless Steel, Compatible Bore Diameter - Minimum 7 in, End Marking Color Silver, Stem Marking Color Black.