Features:AR Picatinny Weaver 1/2" Riser Scope Rail Mount 9 slotThese risers are 100% solid Aluminum. They secure tightly to a standard picatinny rail. Will not be disappointed with the quality of these risers.1. Quick release Thumb tightening system，Mounts to a common 20mm rail system.2.Fits AR series/M series and the other Flat Tops.3. See Through design allows the users to see the iron sights when mounted.Specifications:-Material：Aluminum AlloyColor: BlackWeight：127gSize: Approx. 8.5x3x2cmHole Size: Approx. 1.3x1cmSlot Size:Approx. 2.2cmPackage Includes:1x Scope Riser Base Mount