I love the FIFO system! But I wish you could select which widths you get - I just need the smallest size, and I have a bunch of useless longer joiners, so now I need to see if I can order them separately.This is a great system and perfect for my pantry. My one complaint is that it comes with 3 different lengths of dividers for assembly so you can accommodate different sizes cans, but not enough to have the same size for the entire rack. I’m using this to organize canned beans in a standard 15 oz can. I’m only able to make two of the compartments this size and the cans fit and roll perfectly. For the third compartment I had to use the next size up, which is just big enough that the cans don’t roll easily and need a little extra help getting in the right place. It’s annoying but I can make it work. I just wish they would include one extra set of the most common can size.This will fit in an 18" pantry, as you can see in the picture the cabinet is about 16.5 inches across inside. We had just gotten a "(18 in. x 84 in. x 24 in.)" pantry (typical big box floor stock) and were looking for a better way to store cans. Some tinkering is required. We used the 6 small and the 3 medium pegs.You WILL need to assemble the two end pieces first using the small pegs then do the final assembly IN the pantry with the medium pegs. To do that you will need to drop the shelf down, insert the two sides of the can holder with the back facing towards you and put the back pegs in first. Then rotate the semi-assembled can holder so faces front and put the last peg in. (If you do this incorrectly it will be upside down, so initially make sure your end pieces will end up the correct way after you rotate them 180°.) reinstall the shelf.We found that the medium pegs on the sides were too big for some cans but that was an easy fix with a piece of cardboard.We actually will be buying another. This holds 30 cans and is a super handy space saver. Great way to rotate the cans so they do not expire.These trackers are well conceived, allowing for older stock to be located and used first with newer stock bringing up the rear. The design is cleaver, but in order to accommodate a variety of can heights it comes with 5 sets of 3 widths of plastic (locking) dowels (2 short, 2 medium, 1 long) that lock the panels together. You use 3 of the 5 sets per kit resulting in three can slots or channels. If you combine 2 kits, you may attach them to yield 7 channels and so forth. I found I needed almost exclusively the short (“C”) dowels and even they were a bit too wide for soup & enchilada sauce (10 oz) cans. Works great for 14.5 oz cans (diced potatos, chili beans, chili, green beans). Thanks to a question answer from ‘SH’ I knew that 3/4” wood dowels could be substituted for the plastic dowels. I found that using 3/4” fender washers with 1/2” #8 pan head screws precluded the need for waiting for glue to set (though I did use some Gorilla glue as reinforcement). Four and 7/16th inch dowels worked well for 10.5 oz soup cans and 10 oz Rotel and Old El Paso enchilada sauce cans.Some people have complained that the wings on the panels that form the channels of too narrow allowing cans to fall through; however, when using the right sized dowels (corresponding to the size of the cans) this has not occurred. Minus one star for having to make my own dowels. The “C” (shortest) dowels are best for most cans on grocery store shelves. If the kits would have shipped with 3 C’s, and 1 each of the A & B dowels, it would easily garner 5 stars. Highly recommend if you don’t mind about one-half hour to customize a couple of kits.Seems to assemble pretty solid. My 9yo daughter put it together. Not difficult. Time will tell how the plastic holds up. My only complaint is that there are not enough posts to fill all rails with standard 15oz cans. Needs 3 more C-sized posts to be perfect.Had a little trouble assembling this as the holes in the front seem slighter smaller than ones in the back and were a struggle to insert. I wish there had been more of the mid-size pegs as I needed more storage for mid-sized cans than the large or small ones. Overall, this does work well in my pantry and I really like the FIFO way it dispense the cans. May take another reviewer's suggestion to add cardboard to the larger can rack so I can use it for mid-size cans.I really like this item but it is very noisy when putting the cans in but relatively quiet when taking cans out. I wanted all three columns (U shaped) to accommodate the standard size can but you can only do two columns the same width. The third column must be smaller or larger width. I was able to cut about an inch or two out of the three long pegs and re-glue them using three small metal tubes and glue that way my third column was the same. Also fully assembled the unit would not fit inside the opening of my built-in pantry top shelf so I took the unit apart and then first put the parts inside the pantry top shelf and then reassembled it inside the pantry and it works very well. I like this item very much but I wish they would have included 9 standard pegs instead of just six pegs standard, 3 pegs short, 3 pegs long (it takes 3 pegs to make/strengthen a column) however I love it and I'm thinking about buying another one or two. There may be a hack to get 3 standard columns by just using two pegs on each column (use one peg across the bottom, one peg across the middle, and don't have a peg across the top). Another hack to get the third column the same would be to buy an appropriate size wooden dowel and cut into 3 pieces the same length as the standard pegs and then liquid nails glue in the three wooden pegs that you created across where the top peg would have been. Note that the bottom and middle pegs take the brunt of the horizontal forces so you may be successful with just two pegs per column. This may not be an issue for you if you want the third column to accommodate a different size can.This worked well for me. Although it didn't fit in my cabinets I found a home in my teeny tiny kitchen. I would have liked more of the smaller divider pieces for smaller cans, but that's just what I needed/preferred. It's a good tool in my kitchen.