IRON JIA'S Tactical Red Dot Sight Scope 20mm Weaver Rail Mount with optional Dual High/Low Profile Rail Mounts and quick release Objective Diameter: 0.79'' Exit Pupil: 2.4'' Length: 2.6'' Tube Diameter: 1.2'' Material: Black Anodized Aluminum Body Dot Color: Red Green Dot (LED, 100% safe for the eyes) ,Rail Type: 0.79'' Weaver rail without CR2032 button cell Dimensions: Length: 2.55&#034; / 65mm Width: 1.57&#034; / 40mm Height: 1.77&#034; / 45mm Weight: 117g (4.15 oz) Obj. Aperture&#034;22 mm Magnification:1x Field of View:50 degrees Eye Relief:Unlimited Reticle Type:5 MOA Finish:Black Matte