Traxxas 1747R Blue-Anodized Aluminum 4mm Flanged, Serrated Lock Nuts (set of 4) Aluminum flanged nuts Serrated (4mm) (blue-anodized) (4) Use Traxxas stock and hop-up replacement parts to get the most out of you Traxxas RTR vehicles This product is made from high quality materials and designed for lasting performance This is for use on RC vehicles, consult your user's manual for exact parts listings