This plate storage tree attaches to the rear of the York FTS Power Rack. If desired you can buy two, one for each side of the rack.
Each tree has 4 pegs to hold plates. The pegs are 1" diameter to fit standard or olympic plates.
Note that the two pegs facing toward the inner of the rack is close to the rear upright. There is about 6.5" of space between them and the rear upright, so you can typically fit 25lb plates and smaller. On the outer pegs you can fit any size.