SPECS: Aluminum, hardcoat anodized, matte black. Rubber-coated eyepiece. 1.65” (4.2cm) eye relief. Submersible to 33 ft. Fits any model EOTech Holographic Weapon Sight. 3x Magnifier – 4-7⁄16" (13.8cm) long, 1-15⁄16" (4.9cm) diameter at widest point. Total weight: FXD – 10.5 oz. (297g); FTS – 11 oz. (312g). Actual magnification: 3.25x. Field of view: circular, 6 degrees. Operating temperature range: -20º to 140º F.