UTG 3X Magnifier with Flip-to-side QD Mount, W/E Adjustable Features Broadband Multi-coated Lens to Provide Crystal Clear 3X Image Wide Field of View 30% Bigger Than Comparable Models from Other Brands Windage/Elevation Adjustability for Optimum View Centering Innovative Flip-to-Side Mechanism for Quick Transition between 1X and 3X Image Adjustable Eyepiece for Easy Dioptric Correction Precision Machining and Anodizing for Maximum Strength and Wear Resistance Patented Quick-detach Lever Lock Mounting Base 42mm Center Height for Most Common Dot Sight Combination Completely Sealed and Nitrogen Filled for Fog/Weather Proof Specifications Magnification 3X Tube Diameter 44mm Objective Diameter 25mm Field of View 100 yards 45 Eye Relief 2 Exit Pupil 8.7mm Length 4mm Weight 11.82 oz Leapers Inc. UTG 3X Flip-to-Side Magnifier UTG 3X Flip-to-Side Magnifier