Professional 6mm copper eliminator bore brushes designed for effective cleaning and maintenance with 8-32M threading compatibility.6mm Copper Eliminator Bore Brush - 3 Pack8-32M standard threading for universal compatibilitySpecialized copper elimination designProfessional-grade construction for durabilitySKU: B-24NAEssential for proper firearm maintenance these bore brushes effectively remove copper fouling and debris to maintain optimal barrel condition and accuracy.