First of all these are not what they say it is, its not a complete kit, if it were complete you could just mount it with no other requirements, but you need the brakets that mounts to the wall, there are no brakets and one shelve is deeper than the other, worst purchase I've ever made, image getting the shelve and finding out there is no brackets that are clearly shown on their ad, I don't ever buy Rubber Maid products anymore, this company is the worst to deal with, their customer service can't understand the danger that this shelves pose, the short shelves braket sticks out and can cut you if you accidently bump it.