Flexible Cylinder Hone Compatible Bore Diameter - Maximum 5 mm Compatible Firearm Caliber Not Applicable Stem Diameter 0.08 in Abrasive Length 1 9/16 in Overall Length 7 7/8 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 6 5/16 in