42 in, Abrasive Length 7 in, Overall Length 17 1/2 in, Abrasive Material Aluminum Oxide, Grit 180, Operating Speed - Maximum 600 RPM, Primary Material Application Stainless Steel, Compatible Bore Diameter - Minimum 6 1/2 in, End Marking Color Red, Stem Marking Color Black.Flexible Cylinder Hone, Compatible Bore Diameter - Maximum 7 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.