The J. Dewey Large Brass Brush Adapter is designed for .27 caliber and larger firearms providing reliable thread and gender conversion for cleaning rod systems.J. Dewey Large Brass Brush Adapter (.27 Cal & Up)Converts and adapts thread patterns and gender connectionsAll brass construction for durability and longevityCompatible with .27 caliber and larger firearmsHigh quality manufacturing for long-lasting performanceEssential for firearms maintenance this adapter ensures proper fit and connection between cleaning rods and brushes for effective bore cleaning across multiple caliber systems.