These are sturdy little shelves with rubber stops on the bottom to prevent sliding and allow for stacking. They are great for hard surfaces like tables or floors. I wouldn't recommend it for thick carpets. I have a vertical rotating media shelf (18 x 34 squares and 5ft high) that has been filled. The shelf is perfect for a small space, so I was looking for a way to expand it. I bought four of these little guys not expecting much, but they fit perfectly on my other L-shaped rack, back to back, leaving about 2 inches from the edge. They don't slip or wobble when I add or remove drives and (4 racks) is a stable 56 drive expansion. I tested the installation on top of each other and it was still stable so I immediately ordered 4 more to make a 2nd row and add 112 to my rack. It's a solid extension.
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