Holds door open at a 90 angle from the RV. Often used where a water heater, awning arm, or slide-out may interfere with the door opening completely. Mounted near the hinge of the door and can be used on any type of door. All mounting screws are included. Will not replace plastic 90 units exactly - If replacing a plastic 90 holder, it will be necessary to relocate one side of the holder due to the length of the T-stems. Mounting screws included. Lifetime warranty.