The nylon control horns are used to connect control surfaces such as rudders and ailerons to the airplane. The nylon control horns sandwich the control surface between the two horn bases and offer a no slip installation. The backplate pushes over the teeth on the horn and locks it into place, no need for glue or screws. This set also includes a compatible Nylon clevis for threaded or push fit rods. It has a shaft on the side for a 2mm grub screw for secure fixing.