Flexible Cylinder Hone Compatible Bore Diameter - Maximum 6 in Compatible Firearm Caliber Not Applicable Stem Diameter 0.35 in Abrasive Length 6 1/2 in Overall Length 18 in Abrasive Material Silicon Carbide Grit 120 Compatible Tool Type Combustion Cylinder Operating Speed - Maximum 600 RPM Primary Material Application Steel End Marking Color Green Grade Coarse Stem Length 11 1/2 in