The 45° muzzle/cylinder chamfering cutter is designed to break the edges of rifling and chamfer revolver cylinder chamber mouths for cleaner bullet exit and faster reloads.
It comes with a handle, one steel pilot for .17 caliber, and is packaged in a polypropylene box, with additional pilots available for various calibers.
The set includes a hardened steel cutter, aluminum handle, and steel pilot, with the cutter diameter varying between ½" and 5/8" depending on the set.