The 45° Muzzle/Cylinder Chamfering Cutter & Steel Pilot by Brownells is designed to chamfer the edges of rifling and revolver cylinder chamber mouths for clean bullet exits and quick reloads.
It includes a cutter, handle, and one pilot suitable for .22 caliber centerfire muzzles, all contained within a polypropylene box, with additional pilots available for different calibers.
The cutter comes in two sizes, ½" or 5/8" diameter, with the larger size intended for chamfering bigger barrel and cylinder mouths, and is made from hardened steel for durability.