Brush Research 00049 Shotgun Barrel Flex-Hone, Aluminum Oxide, 12 Gauge, 800 Grit (Pack of 1) Flex-Hone tools will improve the look of your shotgun barrel, while making it easier to maintain The unique fingers gently smooth the metal, creating a more uniform surface that resists wear, corrosion and reduces fouling The end result is a more polished smoothbore with a beautiful finish For smoothbores only The stem wire is covered with a protective shrink tube coating to protect the barrel