The most complete, accurate, easy, and inexpensive way to bore sight your firearm, simply slide the laser cartridge into the caliber-specific sleeve for your rifle insert it into the chamber, a laser dot is then projected down the exact centerline of your barrel for an extremely accurate scope or sight adjustment. Precision engineered for a perfectly centered dot every time. Includes .223 bore sighter; short-action arbor for .243 Win., .308, and 7mm-08; long-action arbor for .30-06, .25-06, 270 Win., and .35 Whelen; and a magnum-action arbor for .264 Win., .300 Win., and .300 WEA, all packed in a convenient nylon carry case for storage.