The Wheeler Picatinny Scope Rings 2 piece 1 inch Medium feature drastically increased clamping force can be applied with a 6 hole version of rings. The retained lock nut securely attaches to pic rail. It features integrated anti-cant level swing out and flat top on ring for leveling. It also has the ability to position anti-cant indicator on the rear ring or the front ring. These scope rings feature 6061 aluminum construction.