Lightweight aluminum, flip-up sights provide instant backup if your primary sight fails or the tactical requirements change. Innovative, spring loaded detent button locks the sight in the upright position to ensure it won't fold down unexpectedly. Steel cross-bolt is countersunk to provide a smooth, snag-free surface. Clamps to Picatinny or Weaver-style flattop rails and with proper setup will co-witness with an Aimpoint, EOTech, or similar red-dot sight system. All models feature standard military A2-style double peep apertures for an excellent field of view for both short- and long-range targets. Large, knurled windage knob is easy to grab and provides 0.48 MOA adjustment on M162E Mfg: Gg&G SPECS: Base - 6061 T6 aluminum, matte, black, hardcoat anodized finish. Aperture/Hardware - 4140 steel, matte, black, mil-spec manganese phosphate coating. 2" (5.1cm) overall length (folded), 15/32" (2.9cm) high extended, 11/16" (1.7cm) high folded.