Description The conveniently packaged Tipton 13-piece caliber-specific set of Best Bore Bronze Brushes means that you always have the right brush at hand. Contained in a durable, hinged box with marked cavities, it’s easy to select the correct Bore Brush for your particular application. Because they are caliber specific, you can be assured of an optimum fit to your firearms bore for efficient and thorough cleaning. .17-.45 calibers. All brushes have 8-32 threads (17 and 20 caliber have 5-40 threads) and is a standard bore brush. Adapters for RAM / Parker Hale Rods to use these jags are available here.