The .30/8mm Copper Eliminator Female Thread Jag is designed for effective barrel cleaning with 12-28 threading and specialized copper elimination capabilities..30/8mm Copper Eliminator Female Thread Jag12-28 thread specification for secure attachmentFemale threading designOptimized for .30 caliber and 8mm firearmsCopper eliminator construction for thorough cleaningEssential for maintaining firearm accuracy and barrel condition this jag provides reliable cleaning performance for .30 caliber and 8mm firearms with compatible cleaning rods.