LVLING 2 Pcs 20mm to 11mm Weaver to Dovetail / Picatinny to Dovetail Adaptor Scope Ring Adaptor Picatinny/Weaver to Dovetail Adaptor Made from High Quality Aircraft Grade Aluminum Alloy 38mm total width (Including Bolt) 20mm Weaver gun rail fitting Big Thumb Nuts and Locking Plate for Easy and Quick Installation