American Defense Manufacturing Holosun 510C Mount Tactical Legacy Lever Lower 1/3 Co-Witness Mount Height Black. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the Patented QD Auto Lock Lever system to accommodate both in spec and out of spec rail systems. Specifications for American Defense Manufacturing Holosun 510C Mount: Manufacturer: American Defense Manufacturing Finish: T3 Mil-Spec Anodize Fabric/Material: 6061-T6 Aluminum Fit: Holosun 510C Co-Witness: Lower 1/3 Red Dot Sights-Footprint: Holosun 501C Optic Cut: Holosun Condition: New Features of American Defense Manufacturing Holosun 510C Mount Does not 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. Precision machined from 6061 T6 Aluminum. Hard coat anodized for a lifetime of performance. Fully adjustable to fit both in spec and out of spec rail systems. Features the Patented QD Auto Lock Lever system. Package Contents: American Defense Manufacturing Holosun 510C Mount American Defense Manufacturing AD-510C-11-TAC: Holosun 510C Mount Tactical Legacy Lever Lower 1/3 Co-Witness Mount Height Black