12 Gauge ChamberMate Rod & Brush Combo KleenBore Chambermate shotgun cleaning tool is great from removing plastic and powder fouling from chambers and the choke area. Helps in cleaning muzzle ports during use as well. The ChamberMate is a rugged shotgun tool that has a durable aluminum rod and fixed T Handle. Features: 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 Made in USA