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(R) 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