Jags are a cylindrical point that attaches to the end of the cleaning rod, usually with ribs and a needle point. They are used to push patches through the bore and give the patch a tight, consistent fit to help wipe fouling away. The tip of the jag is usually pressed through the middle of a patch. Next, the patch is wetted with solvent (or sometimes kept dry) and pushed through the bore with the cleaning rod, and then it falls off the end as the rod is pulled back out.