How it's made. The panel hangs on the upright's teardrop holes the way a beam connector does - lift to remove, no tools - and stands 6 mm off the steel. Its holes are the Wall Grid's: the upright's own teardrop, on a 20 mm pitch. Every piece has round-headed hooks that go through the round part and drop into the slot; a 45° shoulder under each head beds into a matching chamfer, so the piece's own weight pulls it into the board and holds it there. Lift it a few millimetres to take it off. Slot sizes differ by maker, so pick A, B or C or type your own from a caliper; the Rack Panel's fit strip has all three. Made with the hooks up, in PETG. Made for tools, labels and small stock, not for load.