Precision machined from a solid block of top-grade billet 6061T6 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; Fits Remington 700; Also fits the Remington model 721 and 722, and Bergara B14; Right hand mount fits right hand firearms and left hand mounts fit left hand firearms; Base screws are 6-48 x 1/4" long; Ring screws are 6-40 x 5/8" long; Both use a 7/64" Allen wrench; Made in the USA