This is an Extended Body Mount Kit with Secure-Loc Caps for the Rustler® 4x4. Pro-Line continues to innovate with more must-have accessories for your truck. The all-new Pro-Line body mount kit includes adjustable body mounts so you can fit different bodies onto your truck while still working with the stock body! But Pro-Line Engineers did not stop there. Instead of just using the stock body mounting system that always causes your body to pop off and go flying, the Pro-Line Extended Body Mount kit includes a revolutionary screw on body mounting system for a strong and secure mount every time. No more doing the walk of shame to pick up your lost body! Just screw down the included setscrew into the body mount, place the O-Ring over the setscrew and mount your body as you normally would, but with the added safety, security and styling of Pro-Line's innovative screw on body mounting system!