Brownells 10 Gauge 5/16-27 Male Double-Tuff Bronze Bore Brush, Pack of 3

The extra-thick, kinked phosphor bronze wire provides the robust scrubbing action necessary to effectively remove the most challenging debris from bores. While significant effort is required, the results are highly satisfactory. The bristles, made of extra-thick phosphor bronze, are designed to avoid scratching bores, making them ideal for eliminating persistent carbon deposits. Phosphor bronze bristles with enhanced thickness Precision-engineered steel, meticulously looped and expertly wound to form a robust shank structure