Having recently down-sized big-time, I have constantly been looking for ways and means to find extra storage, and to utilize every bit of space in our condo that I can. While looking for something else, I became aware of these shelves. I measured and imagined and realized I could really benefit by adding these shelves in my kitchen, using "dead" space above the plates, glasses, etc. Initially, I felt that 2 shorter and 1 longer would help free up space in the dishes, glassware and casserole cupboard. While reading reviews, one mentioned purchasing a 6-pack. Discovered it was cheaper to buy the 6-packs, than the individual shelves. I wasn't sure what I would do with 12 shelves, but by the time I received them, I found areas to put them and used all but 1!! Inside the kitchen or bathroom cupboards, these sit perfectly and are strong enough to hold several plates, bowls or casseroles. I put 2 on open shelving (no sides or backs to the shelves) in a storage cupboard, and have to be cautious when removing anything from them. It's possible they will slip off the open shelves. Other than that, 100% approval.