Conveniently packaged 8-piece caliber-specific set of Bore Brushes means 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 firearm's bore for efficient and thorough cleaning. 22 to 480 caliber. All brushes have 8-32 threads.