Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What are the dimensions/measurements of the four screws that hold the arms in place?
Document: strong, sturdy. Now my umbrellas aren't sliding everywhere and my kids don't knock this down. I agree with other posts re: coat arms attachment issues. The holes don't line up nice and I had to really force the screws in. One screw I ended up stripping in my efforts and my husband had to get a regular screw and drill it in.
This is a nice product and we are pleased with it. The one issue that I have with it is that the coat rack hangers need to be attached when you get it. The design of the way they are attached could be better. You can't get all of the "wabble" out of them because the screws can't be but so tight without stripping them out. Even when tightened as much as possible, the coat rack arms do not feel secured, there is some play in them.
As far as I can tell, this product is defective. The coat hanger arms are not contoured in such a way that they can be attached securely to the stem of the coat wrack. They will rotate left or right, or wobble back and forth. The screws that attach them are not secure, which results in stripping the screw threads by attempting to tighten them. I spent three hours trying to assemble it.I would not buy this product again, or recommend it to anyone.
I am very pleased with this product for several reasons. First, it has small base measurements but maintains ornate characteristics. The assembly was very easy and straightforward, taking approximately 10 minutes to finish. And finally, it is a sturdy item that we use daily. For our family of four, it holds 4-6 coats, 2-3 hats and 2 bags at any time during the day without threatening to tip over.
My wife and I were very disappointed with this product. First, when you attempt to screw in the hooks at the top of the coat rack, your first instinct is to tighten the screws because the hook is still loose. When you do that, you strip the screw (had to use liquid nail to keep hook in place). Second, the coat rack itself is very uneven, it doesn't lay flat on the floor (it wobbles). PLEASE DON'T WASTE YOUR MONEY!!! !
I was looking for a Victorian-styled metal coat rack that would be sturdy enough to hold heavy winter coats, both for my kitchen and office. This coat rack appealed to me because of its look and its bargain price. The bottom is substantial and already assembled, and all that was left was to screw in place the hooks on top and screw together the support pole. It looks great and seems to be totally functional.
If you use just the bottom part for an umbrella park, it works ok, but the screws that hold the hat-racks to the vertical pole will strip out the threads on the pole. All 4 brackets bolt on at the same spot around the pole, so you know they can not go through the pole, and the threads on that pole are very strippable - and won't hold. (Maybe it needs a black pipe strap to hold it there - but that would look  goofy).
I was skeptical about ordering this because it was metal and I was worried about whether or not it would be sturdy enough to hold all my coats and sweaters. I received it yesterday and was amazed at how thick the metal is. The product is VERY sturdy and not flimsy at all. It looks great and the measurements were right on the money, so it fits perfectly in the spot I picked for it. My dining room table looks much better without all the coats hanging over the backs of the chairs.
I bought this Coat Rack thinking that I'll be able to assemble it quickly. The hardware included in the package does not fit together. Especially attaching the top four hangers to the center rod is painful. Do not buy this.
nice and sturdy. easy to assemble. only complaint is the arms are not easy to get super tight when screwing in.
Answer: I can't give you the exact dimensions as I would have to dismantle the coat rack to measure the screws. However, the screws are very sturdy and my best guess is  1 1/2 to 2" in length as they fit very solidly into the post. Hope this helps.