Insert the Sightmark laser Boresight into your .357 Mag or .38 SPL pistol just like a standard cartridge and instantly witness a precise red laser dot aligning with your target. Perfect for Hunters, competitive shooters and law enforcement professionals, this tool drastically minimizes the use of unnecessary cartridges and shells. Achieve swift and accurate adjustments to your sights or scope, conserving valuable ammunition for your hunting endeavors. Notably, this device is rigorously tested and endorsed by the National tactical officers Association, highlighting its reliability and effectiveness. Your purchase includes a carrying case, three (3) AG3 batteries and detailed instructions, ensuring you have all the necessary components for efficient boresighting.