Solid brass loops are ideal to hold a patch for cleaning the bore on your firearm without worrying about scratches that can reduce accuracy. Male threads fit most popular rods and adapters. Mfg: Brownells SPECS: Brass. .17-.22 has 5-40 threads; .22-.30 available with 8-32 or 8-36 threads; .30-.38; .38-.45 have 8-32 threads; .50/shotgun available with 8-32, 10-32 & 5/16-27 threads.