Shotgun Barrel Hone, Compatible Bore Diameter – Maximum 3/4 in, Compatible Firearm Caliber 10 Gauge, Stem Diameter 0.22 in, Abrasive Length 3 in, Overall Length 34 in, Abrasive Material Silicon Carbide, Grit 180, Compatible Tool Type CNC Machine, Drill, Drill Press, Compatible Bore Diameter – Minimum Not Applicable, End Marking Color Not Applicable, Grade Medium, Stem Marking Color Not Applicable.