They fit snug and tight, and I have built my own roof rack which I have placed on top of these bars and secured the 3xi6 wooden box on top. So What Are The Cons:1. I was just barely out of warranty when the plastic pieces started to separate around where the can adjusts length. Due to the midsole being white, I have to clean them more often. Only issue is they are on the large side. I could yell louder. I looked at the pictures and thought I had it figured out how it went together. Also a comfortable fit in my small ears. helps tolerate bit of plantar fasciitis. They hold many different sizes of spice jars and since the height is adjustable, we have various height items and different spacing between shelves.