26-piece set gives you the ultimate storage system for your brushes and jags . Neatly organized in a durable, hinged box with marked cavities, it's easy to select the correct jag and 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. 17 to 45 caliber. All jags and brushes have 8-32 threads (.17 and 20 caliber have 5-40 threads).