Standard Uphill Swan Hinge Kit (Includes 1 upper and 1 lower hinge for 1 gate leaf)This is a bolt on hinge kit for installing a double drive gate on a slope, where the top gate will lift as it opens to clear the ground. Can also be used for a single gate that needs to be hinged on the high side or where the ground rises up where the gate opens. Wood and Vinyl hinges are now both the same, and are interchangeable, with the only difference being the screws that are supplied. Aluminum gate hinge sets are built to fit aluminum or steel