Flexible Cylinder Hone Compatible Bore Diameter - Maximum 14 mm Compatible Firearm Caliber Not Applicable Stem Diameter 0.17 in Abrasive Length 2 1/2 in Overall Length 7 7/8 in Abrasive Material Silicon Carbide Grit 320 Compatible Tool Type Combustion Cylinder Operating Speed - Maximum 900 RPM Primary Material Application Steel End Marking Color White Grade Extra Fine Stem Length 5 3/8 in