The BSA Boresighter with 15 Arbors and Hard Case will help you get on paper without wasting shots. Comes with .177 Arbor, .22 Arbor, 6mm Arbor, .25 Arbor, 6.5 mm Arbor, .27 Arbor, 7mm Arbor, 30 Arbor, .32 Arbor, .338 Arbor, .35 Arbor, .375 Arbor, .44 Arbor, .45 Arbor, .50 Arbor. All packages in heavy duty hard case.