quality materials: The 20mm Rail Mount is made from T6 6061 aluminum alloy with an surface treatment to ensure durability and stability, providing solid support for your equipment. compatibility: Designed for 11 slots with a 117 mm length, it is compatible with all standard Picatinny and Weaver 7/8 inch scopes, magnifiers, and other optical devices, enabling a variety of configurations. Easy installation: Includes the screws and can be installed directly in the Ruger 10/22 factory mounting holes. The process is simple and quick, with no additional tools required. Preserve original sighting: The seethrough design allows you to use the original iron sights while mounting optics, so your field of view is not blocked and you can switch between sights as needed. Use scenarios Range/precision setup: Mount a magnified optic on the Ruger 10/22 for target shooting while keeping the original iron sights available as a backup. Quick optic changes: Swap between a compact red dot and a larger optic without rezeroing, thanks to the versatile 11slot rail length and compatibility. Versatile field use: Configure different optical devices for varying targets or environments (training, plinking, varmint hunting) while retaining the option to use iron sights.