Traxxas 6851x is a pre-assembled OEM heavy-duty driveshaft that comes ready to install in your Slash 4X4 or Stampede 4X4 model. It will only fit front axles, either the left or right and comes with the screw pin. 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.