Save time and money when sighting a newly mounted scope with this Bushnell laser boresighter. Lightweight and easy to use, the device's bright, battery-powered laser makes rapid, ultra-precise work of bore-sighting, so you won't waste any ammunition during the process. Created to meet the demands of gunsmiths and serious shooters, the boresighter includes 7 arbors for .22- through .50-caliber rifles and 20 and 12 gauge shotguns. The unit--which runs on three LR-44 batteries (included)--measures 6 inches long and weighs 8 ounces. A simple twist of the end of the boresighter activates or deactivates the laser. Also includes a nylon carry/storage case and hex wrench.