The 25-270 Caliber Copper Eliminator Bore Brush is designed for effective cleaning and copper fouling removal from rifle barrels with 8-32M threading.25-270 Caliber Copper Eliminator Bore Brush 3-Pack8-32M thread specification for secure attachmentSpecialized copper elimination bristlesCompatible with 25-270 caliber firearmsProfessional-grade cleaning performanceEssential for maintaining accuracy and barrel longevity these brushes effectively remove copper buildup and fouling for optimal firearm performance and maintenance.