Easily chamber the Sightmark laser Boresight In your 7mm, .338 or .264 rifle, just like a standard cartridge and witness a precise red laser dot that accurately represents your point of aim. This innovative device proves ideal for Hunters, competitive shooters and law enforcement, effectively minimizing the expenditure of cartridges and shells during sight adjustments. Simplify the zeroing process by making necessary sight or scope adjustments with confidence, ultimately conserving valuable ammunition for your hunting pursuits. The package thoughtfully includes a convenient carrying case, along with three (3) AG3 batteries and comprehensive instructions, ensuring you have everything you need for efficient and accurate boresighting.