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. Medium and fine grits are offered for each gage (180SC/800AO).