Shotgun Barrel Hone, Compatible Bore Diameter - Maximum 7/16 in, Compatible Firearm Caliber .41, Stem Diameter 0.19 in, Abrasive Length 2 1/4 in, Overall Length 34 in, Abrasive Material Silicon Carbide, Grit 400, Compatible Tool Type CNC Machine, Drill, Drill Press, Compatible Bore Diameter - Minimum Not Applicable, End Marking Color Not Applicable, Grade Coarse, Stem Marking Color Not Applicable