Brownells .17 Cal #5-40 Male Bore Mop, Pack of 12

Trusted for generations, this virgin wool mop holds a generous amount of solvent or oil to thoroughly coat your bore. Its soft wool fibers spring into rifling grooves, while the twisted brass shank ensures safe, scratch-free cleaning. Material composition includes wool fibers, brass shank and precision-engineered coupling components for enhanced durability and performance Length is 3.27 inches, thread size is 5-40