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. The VMX-3T Magnifier will work with any of our red dots but it is not recommended for use with the prism scopes. Note. Allows for lower 1/3 or absolute co-witness mounting heights and is ideal for shooters who want to increase the effective range of their red dot sight. Features: Fully Multi-Coated Waterproof Fogproof Specifications: Magnification: 3 x Tube Diameter: 30 mm Eye Relief: 2.2 in Length: 4.3 in Weight: 11.9 oz Field of View, Linear: 38.2 ft at 100 yds Attachment/Mount Type: Flip Mount Optical Coating: Fully Multi-Coated Fabric/Material: Machined Aluminum Width: 1.18 in Color: Black Condition: New Water Resistance Level: Waterproof Lens Material: Glass Magnification Type: Fixed Fogproof: Yes