These were designed to hang on the cabinet doors in kitchen or bedroom. Great for towels, keys, shirts and pot holders. I designed specifically for the Tiffin Cabinets and they have a slight angle on the door side in order to have a friction fit. So know moving around and banging like the metal ones when you are rolling down the road, They are sold in packs of 4. Order with a cupholder and we will ship them with it, so no extra shipping needed.