Rail adapter mount that converts a 3/8 Dovetail to a Weaver rail. One-piece body made of solid aluminum alloy to withstand shock and recoil. Fits 3/8 dovetail mounts, rails, and bases. Built-in stop pin can be applied when needed, and upgraded 3 clamping screws for better holding power against spring or gas piston air guns. Raises the line of sight by 1/2inch to help clear existing iron sights. Clamps and tightens using the included Allen head wrench. Top rail is 4 inches long. Clamping bottom is 3 inches long. Anodized matte black finish We will not ship this item to an international address. U.S Shipping ONLY.