10 Sets Medium Lock On Nylon Control Horn And Clevis 21mm Set Rudder Servo Ailerons Elevators For RC Fixed Wing Airplane Features: Lock on nylon control horn for ailerons, elevators, rudders and similar applications. The backplate pushes over the serrations on the horn and locks it into place, no need for glue. Nylon clevis for threaded or push fit rods. It has a shaft on the side for a 2mm grub screw for secure fixing. Specification: Control horn Length of Horn from Base: 18mm Max Thickness of Control Surface: 6mm Length of Base: 12mm Width of Base: 8mm Material: Nylon Fixing: Lock on Clevis Dimensions: 3.2 x 5.4 x 21mm Package Included: 10 sets medium lock on nylon control horn and clevis 21mm set rudder '