This 12 Gauge Otis Technology bore brush feature phosphor bronze bristles and a brass stem that work together to offer an effective clean without damaging your barrel. Each brush is stamped with the brush size on the stem to allow for easy identification. Otis Technology 12 Gauge brushes are outfitted with 8-32 threads.Cleans: 12gaLength: 2 InchThread: 8-32Includes: 1 Bronze Bore BrushMade in the USA