"These are pretty nice sliding shelves. They arrived in good shape and were packaged well. Installation could not be easier - took me just minutes! You can mount this inside a cabinet or even to a wire shelving system. (I installed in a cabinet.) They provide an easy-to-use template so you know exactly where the shelves will sit and where to install the screws. Pre-drilling pilot holes made it easier. Four screws total, clip in the bottom shelf, attach the posts, and slide the top shelf on... that's it! I like that they give more visibility to items in the back of my cabinet. My minor complaints: The shelves say they are suitable for install in a 21" or wider cabinet. Mine is 21" and I feel like I do lose storage space on the sides - there are a couple inches unused on the sides. I may end up installing them in a slightly narrower cabinet to maximize storage. Also, it would have been nice to have the shelves slide open separately instead of together. They feel pretty heavy even with mostly lighter items on them and I worry the whole system may pull out of the bottom of the cabinet with constant use. We'll see! Overall, I'm happy though and am enjoying the added visibility and function" - Review posted on Homedepot.com