Shotgun Chamber Hone, Compatible Bore Diameter – Maximum Not Applicable, Compatible Firearm Caliber 12 Gauge, Stem Diameter 0.19 in, Abrasive Length 2 1/2 in, Overall Length 12 in, Abrasive Material Aluminum Oxide, Grit 800, Primary Material Application Stainless Steel, Compatible Bore Diameter – Minimum Not Applicable, End Marking Color Blue, Grade Fine, Stem Marking Color Black