Match Grade Rear & Front A2 Sight High Profile Post Features The Removable Rear Sight clamps solidly onto the rail with one "QD"-Quick Detach thumb-nut with retention design and features a superior locking plate to ensure zero movements so that once you set your zero. The rear sight includes a dual aperture rear sight dually serving long and short-range adjustment with 1/2 minute increments for exact precision adjustments of windage and elevation. Front Sight is 1.75" Height. Constructed of aircraft aluminum. All aluminum parts are Manganese Phosphated for corrosion resistance. Top-notch quality at an unbelievable price point. No gunsmithing is required.