Rifle Chamber Hone Compatible Bore Diameter - Maximum Not Applicable Compatible Firearm Caliber 7.62x39 mm SAAMI Stem Diameter 0.14 in Abrasive Length 1 1/4 in Overall Length 8 in Abrasive Material Silicon Carbide Grit 400 Operating Speed - Maximum 1 200 RPM Primary Material Application Stainless Steel Compatible Bore Diameter - Minimum Not Applicable End Marking Color Yellow Grade Coarse Stem Marking Color Not Applicable