Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: how deep are the shelves?
Document: I bought this shelf unit for the kitchen in our new apartment because we needed to free up some counter space. It is just deep enough for the coffee maker (I also purchased a while shelf liner for the top shelf to make things more stable on it) and the bottom two shelves hold my crock pot, stand mixer and juicer. It frees up other cabinet space and makes them easy to access, which is great.
I love these shelves! I am terrible at putting anything together but I trusted some of the other reviewers and purchased this product. This shelf was so easy to put together. I was able to put it together by myself in less than five minutes. I think it would be easier with two people to maneuver the shelves into place, but I was able to do it alone. These shelves are sturdy and deep enough to hold a laundry basket. I loved it so much I bought two more.
Easy to assemble, sturdy, handsome...just what I needed for a pantry re-do. Came in many sizes so appropriate shelves could be combined.
easy to assemble and just right fit for storage plastic boxes. I like the easy adjustment between the shelves and heavy duty steel.
The shelves  are well made ,but when you go to assemble you find out it can't be put together securely. The plastic things that are supposed to hold the shelves are cheap, very poor design.
It's not pretty but it was easy to put together and helped de-clutter my kitchen. I was able to put a lot of kitchen electrics on the shelves so I could free up counter space.
We plan to put both Whitmor shelving units in our bedroom with canvas baskets to hold socks and such. This is a great way to improve your storage space. Any excess space will hold books. The shelves are very strong.
These shelves are sturdy and look good.They came in a small package and required assembly, which was very easy to  my surprise. Anybody who is able to read can follow the assembly directions and get these shelves up 5 to 10 minutes.
I had to take it back. But, this one is high quality. These Whitmor shelves have been excellent in meeting my storage needs. I have recommended them to friends who visit and compliment me on them. If I could give it 10 stars I would.
Shelf is very light weight, all steel except for the plastic friction cones that hold the shelves to the corner posts. It contains a very small amount of material, mostly a bunch of thin wires welded together. It says its rated for 330 pounds, but that must be for use on the moon (1/4 Earth gravity). Putting just 10 pounds on a shelf it makes it creak. Putting 330 pounds on it would be irresponsible.
Answer: I think approx. 10 inches. I used mine for kitchen appliances, and it was perfect for the toaster oven, slow cooker, etc.