AR-15 Platform TFR (Total Fouling Removal) Kit for the AR-15 Rifle (.223 Cal.) is made with black heavy duty long lasting nylon bristles * These brushes were made specifically for your AR-15 and built tough so they can be used repeatedly * Fits Standard American Cleaning Rod with #8-32 Threads * Kit Contains the Following Brushes: Upper Receiver Brush, Bolt Carrier Brush, Bore Brush and Chamber Brush * All Pro Shot brushes are Proudly made of USA components and assembled in the USA, #8-32 Threads