Machined to specific calibers for precision fit. Each .243 brass Jag, 6mm brass Jag is stamped with caliber #8/32 thread for attachment to Breakthrough Clean stainless steel rods.
Standard #8-32 thread (Standard Shotgun #5/16-27 thread on 12g)
WARNING! These products contain a chemical known to the state of California to cause cancer, birth defects and other reproductive harm