The Iris USA Space Saving Slim Shelf was easily put together under 30 mins with just a Phillips screwdriver (I was watching TV, so technically it could have been shorter!) Just screw in the screws provided, top off with the caps provided and you are done.  Pretty sturdy for a small thin shelf.  My son uses it next to his small fridge to store extra sodas, beers, juices, etc. so they can be of reach when transferring over to the fridge when there is room. This is a solid good looking shelf. Not flimsy at all.  Good weight.  My son is very happy with the extra space saving storage.