Pro-Shot's Chamber Maid Chamber Stars remove carbon and fouling build-up in the locking lug recesses of your favorite .308 Cal./7.62mm rifle fast & easy! Just thread onto bore brush and rotate inside lug recesses to remove gunk that was broken loose by using a chamber brush.FeaturesApplies CLP or oil evenly in Star ChamberRemoves loosened fouling/carbon from .308 Cal. / 7.62mm / FN-FAL Star ChamberThreads onto Standard .30 Cal. bore brush (Nylon Bristle Recommended)Strong and Absorbent Industrial Wool FeltFull AR Lug Recess Pattern - Patented Design