Sighting in your scope or iron sights has never been easier or faster than with this inexpensive Universal Laser Bore Sighter. Simply select and adjust the proper barrel adapter, (2 included with kit) slide into the barrel and turn "on." This unit produces a laser beam, projecting a dot aligned from the center of the bore. Following the instructions included, adjust your scope or sights accordingly. This unit may also be used to quickly check sight alignment at any time, especially after a long trip to a hunting location. Made from CNC machined aircraft aluminum and anodized to create a hardened surface, it measures less than 6 inches long and weights only 1-1/2 ounces. This instrument has been precision calibrated to insure an accurate alignment of any scope or iron sights in just minutes. The Universal Laser Bore Alignment Kit comes complete with 2 adapters (covering any caliber from .17 cal. to .22 cal.), carrying pouch, batteries and instructions. Manufactures Website Address www.LaserLyte.com Warranty Information All of our LaserLyte products carry a one-year unconditional warranty against any manufacturers defects.