Flexible Cylinder Hone Compatible Bore Diameter - Maximum 8 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 240 Compatible Tool Type Combustion Cylinder Operating Speed - Maximum 900 RPM Primary Material Application Steel End Marking Color Orange Grade Fine Stem Length 5 7/8 in