30mm Tube for Maximum Light Transmission and Wider Windage/Elevation Adjustment. Side Wheel Parallax Adjustment - New, convenient and user friendly feature, allowing for easy and precise objective adjustment with Red/Green Variable Intensity Dual Illumination Reticle. Target Turrets with Larger and Consistent Windage/Elevation Adjustment Range the Most value for a 30mm tube scope. Crystal clear 56mm objective lets you see more of your target and provides great light transmission for dusk-to-dawn use and delivers ultra-high resolution and performance. Complete with sun shade and flip-open lens caps.