From Exotek Racing:
Heavy duty machined 7075 alloy rear camber mount plate for the Xray XB2 and XT2 Carpet and Dirt Edition buggies and trucks. New updated design now works with both carpet and dirt editions.
Special countersunk mounting holes insures that the camber angle does not change in hard tumbles. Also helps keep camber plate alignment the same if you have to remove it for any reason which means no altered camber when re-installed.