I used the enclosed measuring strip (a long, skinny piece of paper) and the hardware it came with, but for the life of me I could not get anything to line up for a long while. Finally did, and the holes on the shelves wouldn't even hold the hardware. Really upset about this purchase.
These shelves look nice and are easy to install. Comes with a paper guide you tape to your wall to make sure your holes are drilled the right distance. Even though the box wasn't damaged, there were scratches on my shelves. I managed to hang them in a way where I couldn't see them and so it didn't bother me.
I bought two sets of these to hold mugs and coffee flavoring syrup bottles in a beverage display in my home. The width is perfect for holding four large syrup bottles or four wide mugs each, and they look very nice once up on the wall. I've found them to be quite secure and sturdy - no issues with falling or tilting. The only slight downside to these is that you have to be VERY accurate in your placement of the screws to hold these up. There is almost no margin for error if you want the shelves to hang evenly. I can definitely recommend these to anyone wanting an attractive, sturdy, and unique decorative shelving option. Just be prepared to spend the time necessary to carefully set your wall screws.