This belt tensioner replaces the battery spacer on your AE TC6. Unlike the stock factory unit, this piece is spaced out so that the belt does not rub on your battery packs. As an added feature, the integrated belt tensioner is adjustable from the battery side by just loosening and tightening a screw. The benefit of this external tensioner is that you no longer have to take your diffs out to re-adjust the cams in order to set proper belt tension.
The belt tensioner is made out of aluminum and anodized black. It comes with all the necessary hardware, including the bearings necessary to make it work.