Item DimensionsThe HM3X is An Aluminum bodied 3X magnifier that includes a quick release, ambidextrous, flip-to-side mount with Absolute and Lower 1/3 Co-witness mounting solutions. Additional features include 2.75 of eye relief, IP67 certified water resistance, with windage and elevation adjustment for precision zeroing.In the Box: QD Release Mount, T10 L Key, User Manual