Wheel hubs, splined, 17mm, short (2), long (2)/wheel nuts, splined, 17mm (4) (blue-anodized)/ hub retainer M4x0.7 (4)/axle pin (4)/wrench, 5mm Traxxas' 17mm Hex Adapters make it easy to install a wide range of wheel and tire combinations on your Traxxas vehicle. Installation is simple using the included 5mm hex wrench. The adapters' unique splined design offers maximum strength when used with Traxxas wheels, and also fits any standard 17mm hex wheel. Rugged machined-aluminum construction and vivid blue anodizing combine custom looks with maximum performance. The adapters are offered in complete sets to fully outfit one vehicle. Use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles. This product is made from high quality materials and designed for long-lasting performance. This is replacement hardware for use on Traxxas vehicles; consult your user's manual for exact parts listings.