These are two Dubro Heavy Duty Adjustable Control Horns for .40-.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 3mm x 63mm mounting screws Two 8mm nuts Two 1" (25mm) nylon horns Two nylon links with two securing pins built in Eight aluminum spacers REQUIRES: 3/32 hex head wrench for mounting screws (GPMR8002) jxs 6/08/04 ir/jxs