These are two Dubro Heavy Duty Adjustable Control Horns for .91 and larger size aircraft. FEATURES: Self-adjusting, designed to mount 90° to center line of control surface Mounts against angled control surface using no wedges or shims INCLUDES: Two 4mm x 69mm mounting screws Two 8.5mm nuts Two 1.4" (37mm) nylon horns Two nylon links with two securing pins Eight aluminum spacers REQUIRES: 9/64 hex head wrench for mounting screws (GPMR8004) jxs 6/08/04 ir/jxs