Vortex Micro 3x Magnifier - Simple, fast, effective. The push-button design of the VMX-3T engages and disengages the flip-mount, allowing the magnifier to lock in place. The result, 3x magnified or unmagnified views at will. Optics are fully multi-coated for optimal light transmission. Lightweight and tough, hard-coat-anodized machined-aluminum construction ensures durability. Internally nitrogen purged for reliable waterproof/fogproof performance. Ultimate magnified versatility for virtually any AR-height red dot sight. Included in the Box Rubber lens cover; Lens cloth; 3mm Hex Tool; Lower 1/3 co-witness shim; Specs Magnification 3x; Objective Lens Diameter 22 mm; Eye Relief 2.64 inches; Linear Field of View 38.2 feet @ 100 yds; Angular Field of View 7.28 degrees; Length 2.9 inches; Weight 9.55 oz; Fully Multi-Coated Increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces.; Shockproof Rugged construction withstands recoil and impact.; Waterproof O-ring seals prevent moisture, dust and debris from penetrating for reliable performance in all environments.; Fogproof Nitrogen gas purging prevents internal fogging over a wide range of temperatures.; Flip-Up Mechanism Quick flip up/down mechanism can be oriented to flip-up to the left or right.; Nitrogen Gas Purged Gas purged and o-ring sealed for fogproof and waterproof performance in all conditions.; Manufacturer Lifetime Warranty ;