Good for heavy racks
Crutchfield Customer Review (What's this?)
These do not lock in place. I have a few of the Sanus skeleton racks so to prevent them from moving when I don't want them to, I used these wheels on the back of the rack and the standard feet on the front. This requires putting the front legs at max height to still level the rack but it is possible to do this.
Pros: They are wheels
Cons: These do not lock in place