The Pro-Shot Brass Patch Holder is designed to assist with cleaning the bore of the firearm by holding the patches. This is particularly useful when applying solvent to patches before beginning the cleaning process, and prevents hands and other unwanted contacts with solvents. Manufactured to fit American standard shotgun #5/16-27 threads, this Pro-Shot Brass Patch holder is compatible with 410 gauge to 10 gauge shotguns. PSA is your source for gun maintenance tools, solvents, materials, and more!