Somewhere in the description of the item, it mentioned 2nd shelf adjustment. I recieved the stand, and during assembly (simple) I didn't see a way to adjust 2nd shelfe. I was so distracted, that I missed seeing the adjustment for the top shelf. It's assembled, but only 26" high. I ordered 30" hiegth. so I sent it back for replacement. After assembly of the 2nd stand ( which was of heavier construction, but no wheel locks) I disdcoverd what the buttons on the sides were for, and raised my 26" to 30" duh. If the supplier had been a little more descriptive in his ad or parts list, it would have been helpfull, and prevented this costly retuirn. Sorry Amazon.