The .20 Cal Male Thread Jag features 5-40 threading and is specifically designed for copper elimination during firearm cleaning and maintenance..20 Caliber Male Thread Jag5-40 thread specification for secure attachmentCopper eliminator design for effective cleaningMale threading compatible with standard cleaning rodsPrecision machined for reliable performanceEssential for shooters and gunsmiths who need effective copper fouling removal from .20 caliber firearms ensuring optimal accuracy and barrel longevity.