This NcStar Cartridge Red Laser Bore Sighter Set , now you can sight in all of your favorites firearms with The NcStar Cartridge Laser Bore Sighter Set. They've included the most popular gun caliber sizes including .223 REM., .308 WIN., 30-06 SPRG., and 7mm REM MAG. With this set you can bore sight up to 20 Calibers! Each Cartridge Laser Bore Sighter operates independently so you don't have to worry about using arbors.Features: Ncstar warranty Caliber sizes include .223, .308., 30-06, 7mm