100 percent CNC T6061 aluminum construction featuring micro adjust elevation and windage, tool-less feature on windage and elevation adjustment and a 1.625â?쳌 inside diameter round aperture. Accepts 1.75â?쳌 diameter lens. Includes laser etched elevation and windage scales, rheostat LED light kit, 3rd axis adjustment, 6â?쳌 dovetail bar mounting system with built-in offset for extended sight window and an anodized matte black finish.