Tetra Gun Brass Jag Close Tolerance Fit Provides Maximum Cleaning Power and Versatility Description.22 Caliber Industry standard 8-32 male thread (5-40 for.17 Cal. &.204 Cal.) 5/16-27 male thread (12 20 28 & 410 Gauge) Accommodates all ProSmith cleaning rods Machined from high quality brass Maximum cleaning power Excellent durability Perfect bore seal and fit.