Shotgun Chamber Hone Compatible Bore Diameter - Maximum Not Applicable Compatible Firearm Caliber .41 Stem Diameter 0.19 in Abrasive Length 2 1/4 in Overall Length 12 in Abrasive Material Aluminum Oxide Grit 800 Operating Speed - Maximum 1 200 RPM Primary Material Application Stainless Steel Compatible Bore Diameter - Minimum 7/16 in End Marking Color Blue Grade Fine Stem Marking Color Black