Features: Game Reaper-2 signature series 2-piece scope mounts Fits long and short actions, some super short actions - left and right hand guns Custom made to fit each Type of firearm and align perfectly with your rifle's receiver Each ring and base is machined from a solid block of top-grade billet 6061 T6 aluminum Internal ring and base design allows for extra eye relief adjustment Eliminates or reduces scope damage from tightening rings Approximately 1/3 the weight of steel Eliminates the need for windage screws that can work loose and cause problems No moving parts between the firearm and the scope Up to four times the threads of other mounts for absolute strength and security Absorbs shock and withstands temperature extremes better than steel mounts at a fraction of the weight Base screws are #6-48 x 1/4 inches long and ring screws are #6-40 x 5/8 inches long, both screws use a 7/64 inches allen wrench Hole spacing dimensions on front mount and back mount are 0.70 inches, both mounts are not the same part, back mount is taller than front mount because receiver is lower on back end Made in the USA