Flexible Cylinder Hone Compatible Bore Diameter - Maximum 4 1/2 mm Compatible Firearm Caliber Not Applicable Stem Diameter 0.08 in Abrasive Length 13/16 in Overall Length 6 in Abrasive Material Silicon Carbide Grit 320 Compatible Tool Type Combustion Cylinder Operating Speed - Maximum 1 000 RPM Primary Material Application Steel End Marking Color White Grade Extra Fine Stem Length 5 3/16 in