KleenBore Chambermate Cleaning Tool and Brush 12 Gauge 1010217. The heavy-duty phosphor bronze brush with its tapered nose is made to fit these difficult-to-clean areas. Have you ever tried to clean those little holes they call muzzle ports? This tool does it quickly from the inside out. The ChamberMate is a rugged tool with a strong aluminum rod and sure grip handle. Specifications for KleenBore ChamberMate 12GA Shotgun Cleaning Tool and Brush: Manufacturer: KleenBore Quantity: 1 Fabric/Material: Aluminum Caliber: 12 Gauge Gauge: 12 Gun Type: Shotgun Package Type: Clam Pack/ Plastic Features of KleenBore ChamberMate 12GA Shotgun Cleaning Tool and Brush Excellent tool for cleaning 12 GA Chambers/Chokes Large Diameter Aluminum Rod #5/16-27 Threads Heavy Duty 12 GA Phosphor Bronze ChamerMate Chamber Brush Package Contents: KleenBore ChamberMate 12GA Shotgun Cleaning Tool and Brush KleenBore 1010217: Chambermate Cleaning Tool and Brush 12 Gauge