Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: how wide is the 9" two-tier wire baskets? it says its 8-3/4" wide, does that include the slides, or is that the width of the basket.
Document: In total it has cost me $46.90 and I do not have any product. I think the description of the product should have noted that you must have two sideboards to install it. The other two openings have wire pull-out baskets that are larger and free standing.
My cabinet has a 10 inch opening where I wanted to install the wire baskets. It does not have a sideboard on one side because it is part of a wide cabinet with three doors, The picture or information displayed does not show that it needs a sideboard on both sides. I cannot use the product because of that. I paid $16.95 for UPS shipping from OVIS through Amazon. I got the OK to return it to OVIS.
Simple construction, superb quality in basket construction and materials, paired with top of the line heavy duty ball bearing slides. Highly recommended.
Prefect for my laundry cabinet easy to install on very well constructed  heavy duty wire baskets easily slide out for use
Purchased two sets of these after much research to make our city condo's kitchen cabinets more usable. As a former submariner I was trying to make the best storage use of very tight quarters with high quality, easily functioning slide out drawers. This product exceeded my expectations. First of all, they are very heavy chrome and are very sturdy--not the thin PVC coated wire items one often finds.
It needs a better description. It says 18 inch shelf, stupid me I thought that was width which is what I needed. Instead it has ( xs,med ) without the measurement. I asked for 18 inch shelf. Now I have to figure  out a place to use them because I didn't open it for a month.
I used the upper holes on one of my two assemblies to allow storing taller/wider baking pans in the lower pull out drawer. Took about 30 minutes assembly with most of the time spent threading the little screws through tight tolerance holes to put the assembly together. The wood screws for affixing the assembly in your cabinet are self-tapping, so all you need is to place the assembly inside the cabinet and then attach 4 screws on the cabinet floor and 2 screws to the cabinet back wall with a drill bit.
I love the Rev-A-Shelf pull out shelves and baskets. The construction quality is outstanding and with a little reading of the instructions, installation was a breeze.Beware, on the 9 inch shelves, they are 18&#34; deep, I have 23&#34; deep cabinets resulting in a lot of wasted space behind the shelves but I would still buy them again.
The shelves are not as deep as the same product (wider width) purchased at a local hardware store. They had to be installed further back in the cabinet  in order to attach them to the back. Overall, the quality seem to be somewhat lacking.
Quality is excellent with heavy gauge steel that is 3x the weight of the roll out rack it replaced. Not evident in the photo but there are two "U" shaped bars that support the weight of the two rolling shelves and a rear "U" bracket that is attached to the back of the cabinet. Very sturdy design which includes a double set of steel ball bearings to support the weight.Directions in both English and Spanish and very well done and easy to follow.
Answer: The overall width of the unit is 8-3/4". The basket itself is 7-1/2" outside dimension.