VERY100 See Through 3/4" High Riser Base 20mm Weaver Rail Mount AR Dovetail Picatinny Constructed by aluminum alloy in andoized matte black finish. Clever retention thumb nuts and locking plate for easy and quick installation. Has 14 slots to adjust for proper scope position. Fits AR series/M series and the other Flat Tops. See Through design allows the users to see the iron sights when mounted.