Feature : 1. Constructed by aluminum alloy in andoized matte black finish. 2. Clever retention thumb nuts and locking plate for easy and quick installation. 3. Has 7 slots to adjust for proper scope position.4.Fits AR series/M series and the other Flat Tops. 5. See Through design allows the users to see the iron sights when mounted. Specification :Material: Aluminum Length:75mm(3")Weight: 130gRise: 1"