TacFire 13/16 Inch High 2.36" Inch Long 5 Slots Flat Top Compact Riser For Red Dot Sight TacFire Official Product .Great add-on for Red Dot sight , Reflex Sight . With this riser solidly mounts onto your flat top receiver and allows you to mount your red dot sight or reflex sight on top, via the US Forces 1913 picatinny rail using stanag rings. It has an opening underneath to allow the user to utelize their iron sights if need be. 13/16 inch high , 2.37 inches long with 5 slots for weaver / picatinny style mount with 20mm wide See through design allowing you to use your iron sights Industrial grade aluminum , solid construction with black finish , light weigth : 3 OZ Two square thumb bolts with holes on it to allow Allen wrench to tighten down