Rifle Chamber Hone Compatible Bore Diameter - Maximum 5/16 in Compatible Firearm Caliber 7.62x51 mm NATO Stem Diameter 0.14 in Abrasive Length 2 in Overall Length 12 in Abrasive Material Silicon Carbide Grit 400 Compatible Tool Type CNC Machine Drill Drill Press Primary Material Application Brass Compatible Bore Diameter - Minimum Not Applicable End Marking Color Not Applicable Grade Coarse Stem Marking Color Not Applicable