The shelf can be combined with the wrenches (open-end wrench or ring wrench), has the every home improvement, build well. It makes a solid impression. However Poor is the dimensional accuracy. The shelf is so narrow that here only three tires side by side. I have helped me in that I have simply placed the fourth tire horizontally in the upper floor. For customers who want to be the shelf for the storage of two sets of tires, the shelving is not suitable.