Start of lstUrls_of_images_in_html_descriptionProduct Number: 500012 Conveniently packaged 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 Most jags have 8-32 threads, 17 caliber has 5-40 threads End of lstUrls_of_images_in_html_description