Brownells .40 Cal/10mm #12-28 Female Special Line Dewey Bore Brush, Pack of 3

Thread, clean, done - with special line brushes, there's no need for an adapter - they screw into Dewey coated rods and get to work with strong bronze bristles and a gentle-on-barrel brass design. Phosphor bronze bristles, known for their superior conductivity and corrosion resistance, are engineered to optimize performance in demanding electrical and mechanical applications Brass, looped and wound shank