CVLIFE Tactical 6-24x50 Rifle Scope Mil-Dot IR Crosshair Gun Scopes with 20mm Free Mounts 6-24x magnification and 50-millimeter objective lens; Tube Diameter: 1"(25.4mm); Eye Relief: 3.52 Inches With the fully coated optical glass, the scope would give you a bright and high-contrast image. Made of high-strength aluminum alloy and with its one-piece tube construction, the rifle scope is for greater strength and durability. Illuminated Level: 5 Intensity (Red) and 5 Intensity (Green).With front focus eyepiece adjustment, you can shot the target fast and accurately. With the free 20mm rail mounts, you can make the scope installed easily and work perfectly.