The Bushnell Banner Professional Boresighter w/ 3 Expandable Arbors allows you to quickly adjust your scope or sights to align with your barrel for more accuracy and less wasted ammunition. These Bore Sights by Bushnell feature a large diameter objective lens for the best resolution, and works with a large range of firearms with calibers between .22 and .45. Complete with three expandable arbors and a carrying case, the Bushnell Banner Boresighter Kit and Case is all you'll need to get on target and stay on target! Bushnell .17 - .45 Caliber Expandable Arbor Kit Case and Arbors 743333