For taildragger only. Fits RV-7 rudder "tall faring" and standard RV-9 rudder. Web thickness of gust lock = .082 inch. If the clearance of the rudder to the fairing is not greater than .082 inch, this gust lock will not fit. Material is ASA plastic that is weather resistant and sun resistant. The rudder gust lock will not scratch paint. 6 inches of teflon tape supplied to snug the the contact surfaces.