The Muzzleloader Brass Bore Brushes are made to fit all .45 caliber rifle and pistol barrels. The wire brushes are made from non-sparking brass for quick and easy cleaning of your bore. The .45 caliber brass bore brush threads directly onto your ramrod or range rod for easy use. The Muzzle-Loaders Wire Bore Brushes are all you need to make cleaning your muzzleloader a breeze. 3 Pack.