I have purchased 4", 6" and 8" single height spice boxes/rails. In general I like them. I have one small comment that won't stop me from buying again. I've decided to mount the rails using the screw holes next to the rails (Screw the s to the bottom of the cabinet instead of supporting it, I was worried that mounting it on the back would cause an impact and my cabinets would be exposed from the back.) A small gripe is that the 4" rack only has 2 screw holes in the front. All big slides have 4. This is more stable. Suggest to either install two extra screws on each side near the back to prevent sliding back and forth or install with a rear bracket. In general, I am satisfied with the sliding mechanisms. I like the height of the side rails to keep the slides from falling off the shelves, but don't want them to be too high to get in the way of picking up the condiments. I think they work well on shelves that are at or below eye level. You're also losing some of the real estate on the shelf, but I'll most likely be looking for piece by piece. I also wish they were a little cheaper but I don't feel like they are outrageously expensive.
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