Flexible Cylinder Hone, Compatible Bore Diameter – Maximum 4 1/2 mm, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.08 in, Abrasive Length 13/16 in, Overall Length 6 in, Abrasive Material Silicon Carbide, Grit 180, Compatible Tool Type Drill, Drill Press, Operating Speed – Maximum 1,000 RPM, Primary Material Application Steel, End Marking Color Grey, Grade Medium, Stem Length 5 3/16 in