Includes both low profile spring loaded front and rear back up sights that deploy 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; Front Sight Dimensions: 2.4"L x 1.1"W x 0.8"H / Weight: 2.0 oz.; Rear sight features A2 dual aperture (large and 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; Rear Sight Dimensions: 2.4"L x 1.2"W x 0.8"H / Weight: 2.3 oz.; Aluminum main body with steel A2 front post and A2 rear aperture; Mounts onto Picatinny Mil-STD 1913 rails, mounting tool included