I can't believe I hadn't already reviewed these! My house was built in the 70s and has cabinets that were built on site, so none of them are any kind of standard sizes. I put off ordering these for a while because I just felt certain I could find something less expensive that would work with my odd sized cabinets, but I was wrong! Make sure you read the instructions for measuring, and realize that you MUST have a shelf to install the drawer to. I noticed on some of the Slide-a-Shelf products, reviewers mentioned having difficulty with installation - I did everything myself, including installing a shelf where I hadn't had one, without asking my husband for any help. The only difficulty I faced was related to the unavoidable challenges of working in a dark, narrow space. The installation instructions were great, and these drawers are very good quality. I'm about to order a couple more!