The nylon control horns are used to connect control surfaces such as rudders / and ailerons to the airplane. / / INCLUDES: Two Control horn bases (small) / Two Control horn underplates / Four Self tapping screws / / SPECS: Screws: 3mmx15mm / Control horns: ¾" LONG (19mm) / / 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