Brownells 12 Gauge 5/16-27 Male Bore Mop, Pack of 3

Designed for reliable cleaning, this virgin wool bore mop stores a generous amount of oil or solvent and applies it evenly. Its flexible wool follows rifling and the brass fitting ensures a safe, non-abrasive clean. Material composition includes wool fibers, brass shank and precision-engineered coupling components for enhanced durability and performance 2.87 inches length, 5/16-27 thread