Montana X-Treme Cleaning Jags utilize a patent-pending barb design that ensures your patch will stay put. The barbs are arranged in opposing directions to securely grab and hold the patch when both pushing and pulling. Montana Extreme jags are CNC-machined to ensure exact tolerances and are constructed of solid brass for years of service. Standard 8 x 32 thread (.17 and .20 Cal jags have a 5 x 40 threads).