Flexible Cylinder Hone Compatible Bore Diameter - Maximum 2 1/2 in Compatible Firearm Caliber Not Applicable Stem Diameter 0.28 in Abrasive Length 3 in Overall Length 7 7/8 in Abrasive Material Silicon Carbide Grit 180 Compatible Tool Type Combustion Cylinder Operating Speed - Maximum 700 RPM Primary Material Application Steel End Marking Color Grey Grade Medium Stem Length 4 7/8 in