For my use these shelves didn't work out, mainly because I wanted to construct a wall of horizontal shelves, and these units don't allow you to butt the supports up against each other at the stud locations. So, I couldn't quite make them fit in the available space without perhaps compromising weight-bearing strength. That means putting up blocking. Not practical for me. Maybe I'm over thinking it, but it didn't pass my risk assessment. But, if you don't need a continuous run then they're actually quite nice for the money.