Flexible Cylinder Hone, Compatible Bore Diameter - Maximum 1/2 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.16 in, Abrasive Length 2 1/2 in, Overall Length 7 7/8 in, Abrasive Material Silicon Carbide, Grit 120, Compatible Tool Type Combustion Cylinder, Operating Speed - Maximum 900 RPM, Primary Material Application Steel, End Marking Color Green, Grade Coarse, Stem Length 5 3/8 in