This â€œjumboâ€ 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 1â€ square support plate and 1â€ 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.