DNZ's Game Reaper is precision machined from a solid block of top-grade billet aluminum, and is custom made to fit each type of firearm and align perfectly with your rifle receiver with no moving parts between the firearm and the scope. The Game Reaper absorbs shock and withstands temperature extremes better than steel mounts. It is 67 percent lighter than comparable one-piece mounts with four times the threads and precision socket-head cap screws for absolute strength and security. This model is compatible with Winchester SPR right hand short action rifles and has 1" rings with a black matte finish and a medium mount height.Feature: Precision machined from a solid block of top grade billet aluminumCustom made to fit each type of firearm and align perfectly with your rifle's receiverNo moving parts between the firearm and the scope67% lighter than comparable one-piece mounts with four times the threads and precision socket head cap screws for absolute strength and securityAbsorbs shock and withstands temperature extremes better than steel mounts at a fraction of the weightMounts use #8-40 x 1/4 inches long base screws, #6-40 x 5/8 inches long ring screwsOutside to outside of rings is 4.07 inchesMade in the USA