Utg 3x magnifier flip to side qd mount FEATURES-Windage/elevation adjustability-Innovative flip-to-side mechanism for quick transition between 1X & 3X image-Adjustable eyepiece-Precision machining & anodizing for maximum strength & wear resistance-Patented quick-detach lever lock mounting base-42mm center height for most common dot sight combination-Completely sealed & nitrogen filled for fog/weather proofMagnification: 3XTube Diameter: 44mmObjective Diameter: 25mmField of View @ 100 yards:45'Eye Relief: 2"Exit Pupil: 8.7mm Other Features: Magfnifier compatibility, scp-ds3039w perfect match, scp-ds3840w perfect match need to use a.59" or 1/2" riser with the following, scp-rd40rgw-a, scp-rd40sdq, scp-rd40cdq