Flexible Cylinder Hone, Compatible Bore Diameter - Maximum 2 1/4 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.25 in, Abrasive Length 3 in, Overall Length 7 7/8 in, Abrasive Material Silicon Carbide, Grit 320, Compatible Tool Type Combustion Cylinder, Operating Speed - Maximum 700 RPM, Primary Material Application Steel, End Marking Color White, Grade Extra Fine, Stem Length 4 7/8 in