TruScope Boresighter Kit 17 to 50 Caliber By BUSHNELL OPTICS ITEM DESCRIPTION has the Bushnell TruScope Boresighter Kit 17 to 50 Caliber. This Boresight will save you time sighting in your bore sight and money on ammunition. Specification & Features: Arbors included: .177 and .22 and 6mm and .25 and 6.5 and .27 and 7mm. .30 and .32 and .338 and .35 and .375 and .44 and .45 and .50 Carrying case holds 15 arbors Aids in faster "On-paper" time so less ammunition is spent sighting in. Please note that the .177 arbor will not work with 17 Rimfire. Features deluxe roll-up carry case for arbors. Lifetime limited warranty