Ikea IVAR Shelf Bracket/Strut

Ikea's IVAR shelf system is extremely customizable, but a little bit floppy even with the included OBSERVATOR cross-brace. We wanted to add some more stability, so I created some struts to attach to the back of the shelf. The four screw holes that are not countersunk are 5mm ID, which just enough for a #10 wood screw, though I intend to use #8 cabinet screws (similar to https://amzn.to/2P4MBFi).

The two countersunk screw holes are for #8x3/4" screws. The model whose title includes "extra scre