Property: * The machine can test the protuberant part and surface friction, according to the standard ECE R22.05. * Falling object: 15kg * Free falling height: 500mm * Weight force load: 400N= ( 40.8kg) * Release mechanism controlled by electromagnet. * Sandpaper or friction block is pasted on horizontal guide frame, and straight friction with helm shear plane. * Head support is adjustable.