Features: Precision machined from a solid block of top-grade billet aluminum Custom made to fit each type of firearm and align perfectly with your rifle's receiver No moving parts between the firearm and the scope 67% lighter than comparable one-piece mounts with four times the threads and precision socket-head cap screws for absolute strength and security Absorbs shock and withstands temperature extremes better than steel mounts at a fraction of the weight Made in the USA