Flexible Cylinder Hone, Compatible Bore Diameter – Maximum 3/8 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.14 in, Abrasive Length 2 in, Overall Length 8 in, Abrasive Material Aluminum Oxide, Grit 320, Compatible Tool Type CNC Machine, Drill, Drill Press, Operating Speed – Maximum 1,200 RPM, Primary Material Application Stainless Steel, End Marking Color Not Applicable, Stem Marking Color Not Applicable