The BS30 Multi Caliber Collimator (Boresighter) with Arbors is designed for use with pistol and rifle calibers, and helps you get on paper easily without wasting ammo or range time. Get on paper without wasting shots. Comes with .177 Arbor, .22 Arbor, 6mm Arbor, .25 Arbor, 6.5 mm Arbor, .27 Arbor, 7 mm Arbor, 30 Arbor, .32 Arbor, .338 Arbor, .35 Arbor, .375 Arbor, .44 Arbor, .45 Arbor, .50 Arbor. All packages in heavy duty hard case.