It's my second version of a spice rack. The first one is a module for 5 spices from the Mercadona brand or cheaper ones.

I've had these spice racks for several years until my wife asked me for some spice racks from the Just Spices brand. Of course, I've kept the general measurements, including those of the holes, so I can replace one with another without making more holes. They can hold 4 jars. But you can also put in square jars or ones of a larger size than usual.

Now you have the Mercadona spice racks and the Just Spices ones.