.30-06 Springfield 7.62x63mm .207 Caliber Cartridge Laser Bore Sighter Boresighter Class IIIR laser product, &lt;5mW power output. Quality grade Brass Casing Fits .30-06 Springfield, .25-06 Remington, and .270 Winchester Chambers Weight 0.6 oz. with batteries 2 sets of batteries included. Extra sets of batteries for back up. Quick and easy sighting and zero