The American Defense Delta mount is made for putting high power glass onto a flattop style AR-15. The Delta is a cantilever scope mount with 2a ^2 of eye relief built in. Top rail to scope center line height is 1.5a ^2 for 30mm Rings. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize with horizontal split rings. It features the QD Auto Lock Lever system to accommodate both in spec and out of spec rail systems. Doesn't require proprietary tools for adjustment Can be adjusted with your finger or a flat blade screwdriver Lever can be configured to lock to the front or the rear Superior clamping surface to insure maximum rail engagement Specifications Finish Flat Dark Earth Material 6061 Aluminum Height High Style Picatinny Weight 9 Ounce Extended Yes Piece 1 Tube Diameter 30mm Origin United States of America