Flexible Cylinder Hone, Compatible Bore Diameter – Maximum 8 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.42 in, Abrasive Length 7 1/4 in, Overall Length 17 1/2 in, Abrasive Material Aluminum Oxide, Grit 320, Operating Speed – Maximum 300 RPM, Primary Material Application Stainless Steel, Compatible Bore Diameter – Minimum 7 1/2 in, End Marking Color White, Stem Marking Color Black