The conveniently packaged Tipton 13-piece caliber-specific set of Ultra Jags means you always have the right jag at hand. Contained in a durable, hinged box with marked cavities, it's easy to select the correct Ultra Jag 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 (does not include .20 Cal). All jags have 8-32 threads (.17 Cal has 5-40 threads). Features: 13 piece caliber specific set of ultra jags Contained in a durable, hinged box with marked cavities Contains .17 to .45 caliber Jags have 8-32 threads 0.17 and 0.20 caliber have 5-40 threads