Definitely needs extra clips to attach it to the door. Once those were added, works greatI love this product but you can't put anything heavy on itEDIT: turns out that for this new set (well, I bought two more), my doors aren't cooperating; so the unit slides and pouches out. I could probably solve the problem by screwing the shelves against the door (duct tape is not enough), or by covering the door with a towel, but I found a better use for the shelves: as baskets. I placed each of the three-tiered pieces opposite each other, and then wound white duct tape over the 'basket' centers where they met, so they would stay closed. Look at the picture and imagine instead, fastening the two units facing and against each other at their 'basket' junctures:___][___|______|___][___|______|___][___|______|As I tried to show (sideways) above, the result is a three-tiered, double-faced basket which can sit on the ground at waist height (or on a shelf). Each double-faced 'basket' can hold a standard Rubbermaid twin sink dishpan, so if a 'basket' does happen to split apart, the unit as a whole will still function.If the duct tape (or binder clips, even paper clips) hook the facing units rightly to make that freestanding three-tier 'basket' sturdy, you can even hang/carry/hold plant pots (i.e., herbs). Can hang it on a shower, closet, patio or other rod, or easily carry it around rooms or to and from the car as desired, sit it on top of the washer or a rolling cart, hang from the rolling cart, etc. For me, this usage is far more useful than the product's original intent. In particular, rolling carts are designed at waist height, so what if I want them higher? Plop one of these makeshift 'basket' thingies on the highest shelf, then if I need to use the cart's own top shelf for something else, voila, easy to just lift off the basket!The 'basket' will also hang well from a high-enough door, if you use the big white wreath hangers here in Amazon (see my review on the hangers, they are better than you could buy in a Dollar Store). The long wreath hangers angle out, so the (now doubled, facing) shelves are stable. I just don't want to use them that way. Original review, follows below.=================These are half-width and half-height shelves ('half' meaning the amount of door width and height each uses up). But they are very sturdy, and I don't remember ever having to clean them in the past (this is a repeat purchase). The beauty of them is that the steel is strong, the coating is strong, and you don't need special hooks to hang them over your doors. They come in a pair with ONE set of over-the-door thin metal hooks, just as pictured. So, for example, you can instead hang them from a rolling cart (covered below), using mere S-hooks.The over-the-door hooks won't prevent most interior doors from closing, and are also coated (with paint, not plastic). So if you have white doors like I do, the unit is unobtrusive. Great for bathroom supplies, VHS tapes, most handheld books, canned goods. But you do have to be a tad careful when you swing the door.Because the top wire is amenable to any kind of hanging hook, you could instead take the pair and twist-tie them together to make a whole hanging three-tier 'basket', and then hang that 'basket' from some wire rolling trolley/cart/rack (like you can buy from Seville or Whitmor right here in Amazon or elsewhere). So you get an extra hanging space from the same cart space. Of course, in that configuration, what you put in the 'basket' will need to be unbreakable or fairly lightweight, in case you roll the rack often.Alternatively, you can take either or both in the pair, and use them upside down, as sorters/dividers for large mixed objects.Lots of bang for the buck!It comes with screws that you can screw into your door to provide better stability, but I'm renting so I can't use those. The hooks on top that secure it to the door started to bend and I don't have much weight on it, I wish those were a bit stronger. Still works well, I just took some things off of it and bend the hooks back in place every once in a while.I live in a condo that has very limited closet and pantry space, so I was able to hang these on the door to my little laundry room to hold extra cans and pantry items. You cannot overload it if you are using the over the door hangers as they are very thin and mine actually bent and the unit fell. I found some stronger ones that I got with another product and those are working, but you still don’t wanna overload these shelves. It’s kind of a clever design but the hardware is very cheap and weakHolds lots of items and I wish I bought it years ago. We do open the door slower not to move it. Maybe in the near future we will buy something to hold it so we don't have to drill holes in the door.I love it. I wish I'd discovered it sooner.This was used in a dorm closet year, and will be again this year. I came back today to see if I can find replacement door hooks for it, as it seems they were misplaced over the summer, or left on the door of her last dorm. It worked well for fluffy stuff like pasta near the center of the shelf, with smaller cans placed near the edges. Just takes a little space/weight planning. Here are some hints for other purchasers to make it dorm or renter worthy:I got a roll of the non-adhesive grippy shelf liner wide enough for the shelf to rest against, I think it was 20" or 24" wide by at least 5'. Use roll leftovers under a printer, to grip glass jars when opening, or as intended. Sturdy twist ties were used to affix it to the back of the shelf. This helped hold the shelf in place when the door was opened, stopped all that clanging around of cans against the metal door, and kept items from falling out the back of the shelf. The flattened out amazon shipping box also would have worked fine as a shelf unit backing. Once that was done, Command hooks or a similar fastener to anchor it would have been great, but are banned on the rental agreement on any painted surface.Options we came up with, are: - Over the door hooks up from the bottom or sides, wired to the rack if they're too short to reach. Use a little grippy mat under them to help keep the hooks put or take up any door width gap. - Strapping tape works ok for doors with little gap between the trim and door, or where seeing the door with no with no bands of color is desired. Make 2 tabs of tape long enough to reach to the other side, wrapping it around the rack and smoothing both adhesive sides together and then pass the tabs through the door seams. Use another length of tape (shiny side to door) on the outer door to tightly connect the tabs. Cover the exposed adhesive with another length of tape, some paper, a decorative border or hang a poster from it - get creative :) - Duct tape applied same as above with the textured side to the door works even better, if your door gaps are wide enough to allow for the double back. The texture gives it some grip to keep it where it was placed. Duct tape comes in so many colors and patterns now, my daughter had some fun adding a splash of color to an 'apartment almond' room. Or hang a poster on the outer door - the tape's already there!If you have a kid off to a shared apartment or dorm life that has extremely limited space for the personal things, the price is right for its use and does free up a lot of space. Perfect for those that don't want to keep those 'like gold' items such as cookies from grandma, one-cup coffee's for 'that machine', batteries, light bulbs, foil, or garbage bags out in the community space pantry. With a little creativity this shelf unit helps immensely.It is great for storing the jars, tins and bottles.on the weak side but overall a decent product, it organizes smaller items nicely. I put stiffer plastic liner on the shelves so there's more of an even surface for things to sit on. i use it for such things as spice bottles (suggest mostly plastic bottles, not all glass), tape rolls, flashlights, etc. it collapsed once from too much weight (i added 2 larger, glass candle jars and some air fresheners) and the over-the-door hangar on one side un-bent, but because it is not very strong metal it was easy to re-shape and it has been holding fine once i removed the extra weight.I was going to return this because the hangers bent immediately but then I figured I could make it work. be prepared to add washers because if you use only the screws they provide the self will pop right out. you also need to find a stronger hanger, I hung it on another over the door hanger. see picture. as long as you reinforce everything it will work fineSet it up and was very flimsy, the ware it is made of is very weak and the door hangers that come with it bent immediately causing it all and my spices to fall and break. The shelves do not have any back security bar so if rack moves spices falloff the back. comes in 2 pieces and held together with very weak hooks. comes with screws to adhere to wall, however the placement and notches are very small indents and slips off screws. Avoid this product all together. not worth he hassleI use this in back of the door for towels, and extra toilet paper. Excellent and it gives me more space. You can roll a towel into each one, but if you roll two in one together, not large enough. I find it works for me with the one towel easy row.