Flexible Cylinder Hone, Compatible Bore Diameter – Maximum 1 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.21 in, Abrasive Length 3 in, Overall Length 7 7/8 in, Abrasive Material Silicon Carbide, Grit 120, Compatible Tool Type Drill, Drill Press, Operating Speed – Maximum 900 RPM, Primary Material Application Steel, End Marking Color Green, Grade Coarse, Stem Length 4 7/8 in