The TCS shotgun magazine tube patch jag is designed specifically for cleaning the shotgun magazine tube and is made with pride in the USA. These patch jags press the patch that has been treated with solvent or bore paste against the magazine tube to mechanically strip out debris that could inhibit your guns smooth feeding. These Jags are the only jag on the market designed to clean magazine tubes. "The proof is on the patch". In addition to cleaning, these jags are also used for oiling the magazine for storage. The TCS shotgun magazine tube patch jag fit all standard rods with 5/16x27 threads. 12 Gauge 3 O-rings 5/16x27 threads Anodized Aluminum const Mfg: Tcs