GREEN laser boresighter kit with 32 arbors. This kit has 32 expandable arbors for a better fit in more calibers, and a "push button" on off switch. Comes in a hinged black plastic hard case with firm foam padding. Easy to use, instructions included. 2x CR2 battery included (not warrantied). Only requires one battery. For handguns, rifles and shotguns. Ideal kit for gun clubs to carry. Boresighters are ideal for helping you to get on paper before spending expensive rounds zeroing in your scope or iron sights at the range. Top Tip; For more accuracy, the windage and elevation on this boresighter can be adjusted using a gun that’s already sighted in to get it that much closer to the bullseye. Try it at 8-10m inside the house using a bipod for example. Then its mainly a case of scope elevation when completing the sighting in process at the range.