DNZ's Hunt Masters two piece scope mounts are custom made to fit each type of firearm and align perfectly with your rifle's receiver. Each ring and base is machined from top-grade aluminum, which absorbs shock and withstands temperature extremes at a fraction of the weight. The Hunter Masters uses a internal ring and base design which allows for extra eye relief adjustment and has up to four times the threads of other mounts for absolute strength and security. Fits Browning X-Bolt.