IKEA Kallax Compartment Split

This is a simple but effective thing to split IKEA Kallax compartments by half. I have a lot of IKEA Kallax at home and took some of the 1x1 walls out to fit my purposes like clothes rails and others. I've decided to put them back in the shelf at a different position to have smaller compartments.
Using this thing (4pcs required) you can do this without screws. To mount this, you just need to unscrew the Kallax a little to losen it a little.