Flexible Cylinder Hone Compatible Bore Diameter - Maximum 6 mm Compatible Firearm Caliber Not Applicable Stem Diameter 0.1 in Abrasive Length 1 9/16 in Overall Length 7 7/8 in Abrasive Material Silicon Carbide Grit 120 Compatible Tool Type Combustion Cylinder Operating Speed - Maximum 1 000 RPM Primary Material Application Steel End Marking Color Green Grade Coarse Stem Length 6 5/16 in