This is a set of Traxxas 17mm Aluminum Splined Wheel Hubs for Slash and Stampede 4WD vehicles. These 17mm Wheel Hubs (Hex Adapters) make it easy to install a wide range of wheel and tire combinations on your Traxxas Slash or Stampede 4x4. Installation is simple and can be done in less than 15 minutes using the included 5mm hex wrench.