Rifle Chamber Hone Compatible Bore Diameter - Maximum Not Applicable Compatible Firearm Caliber AR-15 Stem Diameter 0.13 in Abrasive Length 2 1/2 in Overall Length 12 in Abrasive Material Silicon Carbide Grit 800 Operating Speed - Maximum 1 200 RPM Primary Material Application Stainless Steel Compatible Bore Diameter - Minimum Not Applicable End Marking Color Blue Grade Fine Stem Marking Color Not Applicable