Du-Bro 133353 - Dubbelarm Roderhorn Heavy Duty XL (2/pkg)This jumbo size control horn has been designed for giant scale aircraft and it boasts two adjustment positions for a superior set up. Made from high strength nylon, you will have the confidence you need when you hit the flight line. With a 1 square support plate and 1 long 4 40 mounting bolts, your install will be rigid! The included 4 40 swivel ball link provides an easier fit and the strong connection you demand. 2 pkg.