The UTG 1x30 Tactical Dot Sight has a 38 millimeter tube with best in class emerald lens coating for maximum brightness and clarity. Consistent and precise coin-adjustable windage and elevation knobs with 1/2 MOA per click increments. Clear and sharp 4.0MOA dot. Optimal brightness settings for variable shooting environment. Great field of view and unlimited eye relief. Includes integral weaver mounting deck and flip open lens caps.