Otis brushes are engineered with a proprietary Tufcor core wire, offering exceptional resistance to corrosion. The tighter twist design enhances bristle retention and significantly extends the life of each brush. These high-quality brushes are perfect for cleaning .30-06, .300, 30-30, .308 caliber, and 7.62mm firearms. Each brush measures 2 inches in length and fits seamlessly with 8-32 threaded rods. This set includes one durable nylon brush and one robust bronze brush, ensuring comprehensive and effective firearm maintenance. Experience the longevity and reliability of Otis brushes for your firearm cleaning needs.