Brass Red Laser Bore Sight.  Caliber-specific brass cartridge bore sight tailored for 7mm Rem Mag barrels, delivering fast and accurate pre-zero calibration. Constructed from premium solid brass for tight, stable barrel fit and long-term durability. Equipped with a 635-655nm visible red laser under 5mW safe power output, with clear dot visibility ranging from 10 to 80 yards. Lightweight cartridge design inserts easily into barrels, helping you align optics and drastically cut down ammunition waste for hunting and range training.