The cleaning kit includes an upper receiver brush, bolt carrier brush, chamber brush, and .223 bore brush, all designed for precision cleaning with close tolerance sizing. Made from a distinctive blue fiber, these brushes are thick, stiff, and maintain their shape better than traditional brass and bronze brushes. They are durable and can be used multiple times before showing signs of wear. For optimal results, pair these brushes with IOSSO bore cleaner and triple action oil to achieve comprehensive cleaning. The shank features a robust design Compatible with 8-32 cleaning rods