UTG Leapers Super Slim Picatinny RMR Mount, Low Profile - Precision CNC Machined from 6061-T6 Aircraft Grade Aluminum and Finished in a Matte Black Anodize - Low Profile 0.40" Saddle Height Positions RMRŽ at a Low Enough Height to Achieve a Comfortable Cheek Weld and Correct Sight Alignment on Most Shotguns and Rifles with Stocks Not in Line with the Bore and Equipped with a Top Picatinny Rail - Utilizes Locking Torx Screws and Square-shaped Integral Recoil Stops for a Secure Zero Hold - Includes RMRŽ Mounting Screws and Installation Tools for a Simple and Friendly Installation CAUTION: Only use the included #6-48 screws for optic installation.