Flexible Cylinder Hone Compatible Bore Diameter - Maximum 1/4 in Compatible Firearm Caliber Not Applicable Stem Diameter 0.1 in Abrasive Length 1 9/16 in Overall Length 7 7/8 in Abrasive Material Silicon Carbide Grit 180 Compatible Tool Type Combustion Cylinder Operating Speed - Maximum 1 000 RPM Primary Material Application Steel End Marking Color Grey Grade Medium Stem Length 6 5/16 in