TRINITY 5-Tier Epoxy Outdoor Wire Shelving with Wheels, Gray

Much better made than similar NSF rated wire shelving offered in the big box stores. However, both units had stability issues on a concrete floor. Prior to loading the shelves two of the wheels in opposite corners rocked even when tried in different places on the concrete floor. When loaded with the heaviest items on the bottom shelf, with over a 100 lbs. on the bottom shelf, the units still had a slight rock to them when wiggled back and forth. One unit had less rock than the other after loading. I'm thinking there are enough differences in the wheel construction to account for this. Both units were assembled correctly and according to the directions. I think there would be no issues if used on height adjustable feet which is available as a separate model. Reasonably stable when moving the loaded units around the concrete floor.