Any gunsmith who does a great deal of work on a specific caliber needs a pilot set. These nine-piece sets are specially ground over and undersized .0002" to the nominal bore dimension to fit any bore more precisely. They fit all of the PTG tooling that use removable pilots as well as the PTG removable pilot chambering reamers. These bushings fit inside the bore to provide perfect fit and alignment. The pilot bushing prevents marking the throat area. They are precisely sized in .0002 increments for various bore diameters. Pilots have 3 Internal Diameters which fit tools and reamers relative to caliber; 22 to 243/6mm caliber, 25 to 7mm/284 caliber and 30 caliber and up. Bushings come in 0.2194, 0.2192, 0.2190, 0.2188, 0.2186, 0.2184, 0.2182, 0.2180, and 0.2178