The instructions tell you to put the wheels on before you put the Shelves on. I bought a set 3 years ago after getting tired of the weighted ones crashing down and chipping the tile around the fireplace. I like the color and everything about it. I use this holder with a bike trainer, and on each ride everything needs retighten. I am really in love with these headphones. *Note: I work in a call center. These shoes hug my feet just right and keeps them in place. Traveling 2500 miles! Interestingly, when I plugged them into my Google Pixel phone, a pop up notified me that they were recognized as Google ear buds and as such there are some special features that come with that. To identify if this will work for you: Double check your headset and pc/device before buying; the headset is easy to check, just count the rings on the plug, each ring is an "R" in the type.