Flexible Cylinder Hone Compatible Bore Diameter - Maximum 12 mm Compatible Firearm Caliber Not Applicable Stem Diameter 0.14 in Abrasive Length 2 in Overall Length 7 7/8 in Abrasive Material Silicon Carbide Grit 180 Compatible Tool Type Combustion Cylinder Operating Speed - Maximum 900 RPM Primary Material Application Steel End Marking Color Grey Grade Medium Stem Length 5 7/8 in