Flexible Cylinder Hone, Compatible Bore Diameter – Maximum 6 1/2 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.42 in, Abrasive Length 6 1/4 in, Overall Length 17 1/2 in, Abrasive Material Silicon Carbide, Grit 800, Operating Speed – Maximum 600 RPM, Primary Material Application Stainless Steel, Compatible Bore Diameter – Minimum 6 in, End Marking Color Blue, Stem Marking Color Not Applicable