Chamber Hones for Shotguns 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. All Chamber Hones are fine grit, 800AO for the ultimate finish.3" abrasive part and are 12"OAL.