Flexible Cylinder Hone, Compatible Bore Diameter - Maximum 4 1/4 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.31 in, Abrasive Length 6 1/2 in, Overall Length 13 1/2 in, Abrasive Material Silicon Carbide, Grit 120, Compatible Tool Type Combustion Cylinder, Operating Speed - Maximum 600 RPM, Primary Material Application Steel, End Marking Color Green, Grade Coarse, Stem Length 7 in