Otis Brushes: Superior Cleaning and Durability Otis brushes are engineered with an exclusive Tufcor core wire, renowned for its corrosion-resistant properties and superior durability. The tighter twist of the core wire ensures exceptional bristle retention, extending the life of the brush and enhancing its performance. These brushes are specifically designed to effectively clean .44 Magnum, .45, .450, .454, .458, and .460 caliber firearms. Each brush is 2 inches long and fits standard 8-32 threads, making them a versatile choice for your cleaning toolkit. The package includes one nylon brush and one bronze brush, catering to various cleaning needs. With Otis brushes, you can count on thorough and reliable maintenance for your firearms, ensuring they remain in peak condition.