Flexible Cylinder Hone Compatible Bore Diameter - Maximum 1 3/4 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 120 Compatible Tool Type Combustion Cylinder Operating Speed - Maximum 800 RPM Primary Material Application Steel End Marking Color Green Grade Coarse Stem Length 4 7/8 in