Allows for the mounting of Picatinny or Weaver standard scope rings, scope mounts, flashlights, red dots,scope sight or other optics，an adjustment in their mounting positions. Solid but Lightweight: Precision machined out of premium T6-6061 aircraft aluminum alloy with high surface smoothness，in black matte anodizing finish, offer durable，safe and lightweig performance in using. High Strength Hexagon Socket Screw， Exclusive customized high-strength screws, fits perfectly factory mounting holes， Screw style and strength standard superior quality to other slotted screws in the market. Easy setup with all screws and an Allen wrench provided, the guide rail is installed into the installation hole by the attached positioning screw，Installs in Minutes! It is easy to be attached and detached from the mounts by the matched allen wrench. Scope mount installs directly to receiver via the factory mounting holes and included set screws with no additional hardware required.