The nylon control horns are used to connect control surfaces such as rudders / and ailerons to the airplane. / / INCLUDES: Two Control horn bases (large) / Two Control horn underplates / Four Self tapping screws / / SPECS: Screws: 3mmx12mm (threaded portion of screw is 9mm) / Control horns: 1-1/8" LONG (29mm) / / FEATURES: The nylon control horns sandwich the control surface between the / horn base and the underplate for high-stress strength. / No slip installation / / REQUIRES: Allen wrench for installation 4-21-94sk / ir/jl