The flip up iron sights for AR-15 rifles front and rear sight set, includes both low profile spring loaded A2 front and rear picatinny rail back up AR-15 iron sights that flip up with a push of a button. Front sight features an A2 front sight post that is fully adjustable for elevation. Front sight height is designed for handguard rails, monolithic receivers, and gas blocks that are at the same height as the AR receiver Picatinny rail. Rear sight features A2 dual aperture (large & small) that is fully adjustable for windage. Knurled windage knob makes adjusting the windage an easy task. Rear sight low profile design folds flat, to fit under the majority of scopes. Sight Mounts onto Picatinny Mil-STD 1913 rails, mounting tool included. Front Sight Dimensions: 2.4"L X 1.1"W X 0.8"H. Rear Sight Dimensions: 2.4"L X 1.2"W X 0.8"H. Sights are have aircraft grade aluminum main body with steel A2 front post and A2 rear aperture.