For those having difficulty assembling this 4 post rack: Yes instructions could be better on a couple steps, but I'd guess you also have difficulty assembling most items overall anyways. Details are in the pictures on which way to assemble this 4 post open rack. Pay close attention to the pictures at the ends of the pieces, as they are shaped differently and if you note the position correctly, you won't have any issues at all. NOTE: Do not try to drill a hole with the electric drill you will need to use, once the threads are cut immediately stop when the head of the screw touches the metal. Items to note: 1) The height of whatever 4 post rack you are looking at does NOT include the wheels. I bought the 20U model which stated 38.7 inches, and with the wheels on comes in at just under 41 inches. 2) Weight capacity says 500lbs. No way this is even close. Instructions as another has shared clearly says 200lbs max. 3) You are going to need an electric drill with a #2 bit. I used a Milwaukee M12 1/4\" impact with a magnetic 4\" bit extension and it worked fine. Set on power setting 1. Not one thing can you use a regular screwdriver when installing this, except to mount the 2 included shelves at the end. So if you don't have an electric screwdriver I would recommend the Milwaukee M12 series or similar. 4) You don't get one of those thin flat cheap wrenches for putting on the wheels. If you want to put them on it's a 9/16 or 14mm open ended wrench. Snug is all you need for the wheels. 5) The first step is the most important one, if you intend on extending the depth for you 4 post open rack needs. Instructions mention, but not a lot of detail. I set mine at 32in deep, which leaves 9 open holes on each end as you assemble the depth rails on the first step. Adjust accordingly for your depth needs. 6) Also note, if you need the depth to be over the 23\" default depth, the top metal piece isn't going to cover the entire top. I put mine covering the front of the r
Tom 
Roland 
