Flexible Cylinder Hone, Compatible Bore Diameter – Maximum 3 3/4 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.31 in, Abrasive Length 5 1/2 in, Overall Length 13 1/2 in, Abrasive Material Silicon Carbide, Grit 120, Compatible Tool Type Drill, Drill Press, Operating Speed – Maximum 700 RPM, Primary Material Application Steel, End Marking Color Green, Grade Coarse, Stem Length 8 in