SME Chamber Laser Boresights 25-06 Remington - Get meticulous accuracy with the most exacting tolerance specifications in the sighting industry. This precision machined caliber specific sighters deliver unparalleled results every single time. Precision Machined Brass Casing For Optimum Accuracy Caliber Specific Factory Alignment High Output Laser Units Include (3) Three Alkaline Button Cell Batteries (Varies By Caliber)