Mil. Spec Brush Cleans The Dirtiest 12 Gauges
A lot of competitive trap shooters use this 20mm cannon brush to make short work of the heaviest 12 gauge chamber fouling. Tool includes the brush mounted on a plastic-covered steel shank with large, easy-to-grasp plastic handle. Replacement 20mm brushes available separately.
Big Book Catalog, Issue:66, Page:318
SPECS: Steel shank, plastic handle, phosphor bronze brush with wound steel core. 20" (51cm) O.A.L. Brush - 5½" (14cm) long, .980" (24mm) dia. Threaded 5⁄16"-18. Fits 10 and 12 gauge chambers.