This allows you to attach an ATX PSU to the side of the Rework frame. This works only with about 90 mm of the rear 8mm rod sticking out from the frame. You'll need two 1/4" screws and nuts to mount the one leg to the frame. Then there are four screws to assemble the parts. The file ATX PSU Holder is a combined part, I broke it up because I was having problems with it printing in ABS without delamination.