Enhance centering with new magnet surface design, featuring concentric circles for improved accuracy during sighting. LED light visible in sunlight, ideal for zeroing optics up to 100 yards. Magnetically attaches easily and securely to the muzzle, preventing slippage. Safely connect to barrel without damaging rifling or leaving behind residue. Suitable for all calibers, simple to use with auxiliary lines for precise centering during zeroing outdoors.