Tipton 13 Piece Bronze Bore Brush Set - Contained in a durable, hinged box with marked cavities, it's easy to select the correct brush for your particular application. Tipton® Bore Brush Sets are available in both bronze and nylon. Bronze brushes are made from premium phosphor bronze for long life and cleaning power. The nylon brushes are made from a material that is unaffected by most modern solvents including copper solvent which can easily deteriorate a bronze brush. Threads fit most popular brands of cleaning rods. Rifle set contains 14 caliber specific brushes (17-45 caliber). Includes:17 Caliber (5-40 threads)338/8mm Caliber20 Caliber (5-40 threads)35/9mm Caliber22 Caliber375 Caliber243/6mm Caliber40/416 Caliber25/6.5mm Caliber44 Caliber270/7mm Caliber45 Caliber 30/32 Caliber50 Caliber