This is an optional Traxxas Aluminum 17mm Wheel Adapter Set, and is intended for use with the Traxxas Slash, Stampede & Rustler 2wd trucks. This kit includes all the components necessary to convert your truck to 17mm 1/8 scale off-road tires including hubs, hub retainers, wheel pins, splined 17mm wheel nuts and an allen wrench for installation.