UTG 3X Magnifier with Innovative Flip-to-side Quick Detach Picatinny Mount Broadband Multi-coated Lens to Provide Crystal Clear 3X Image Extremely Wide Field of View - 30% Bigger to Comparable Models from Other Brands Adjustable Eyepiece for Easy Dioptric Correction Precision Machining and Anodizing for Maximum Strength and Wear Resistance Innovative Flip-to-Side Mechanism for Quick Transition between 1X and 3X Image Patent Pending Quick-detach Lever Lock Mounting Base Optimum Height/Offset for Different Applications Completely Sealed and Nitrogen Filled for Fog/Weather Proof Magnification: 3.00X Tube Diameter: 38mm Objective Diameter: 25mm Field of View @ 100 yards: 45' Eye Relief: 2" Exit Pupil: 8.7mm Length: 112mm Weight: 10 oz