Shotgun Chamber Hone Compatible Bore Diameter - Maximum 13/16 in Compatible Firearm Caliber 12 Gauge Stem Diameter 0.19 in Abrasive Length 2 1/2 in Overall Length 12 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