This is a scale rear bumper and wheelie bar for the Axial SMT10 radio controlled monster truck. This is designed for looks rather than being a functional wheelie bar. There is also a hole for a flag. You will need to use body clips on the flag pole to hold it on. This is designed for a "press fit" onto the truck. You might want to use screws, a flag and/or body clips to hold it on if the press-fit is not sturdy enough for you.
Photos show this item printed in green ABS on my personal printer. Shapeways will offer a better quality, but not this color.
My beadlock rings for the JConcepts Tribute wheels are also shown in the pictures. The two different styles can be found here: