Joiner for IKEA JONAXEL Racks

This joiner helps you position your IKEA JONAXEL racks at equal distances (10, 20, or 30 mm), and make them stiff together.
I used two on the front (top and bottom) and one on the back in the middle.

https://www.ikea.com/us/en/p/jonaxel-storage-combination-white-s89297130/