I bought three sets of these to use on wire shelves, in place of the screw-on rubber feet included with the shelves. Each of the 4 casters has a lock, which is nice -- some sets I've purchased only include 2 locking casters, so having 4 is obviously better. I did take off 1 star because one of the casters rubs itself when it rotates (and it may work itself out over time) but it was still a very minor issue. Overall, the quality is good, the casters are sturdy, and they worked perfectly for my needs. I'd certainly buy these again.
Rating:
[5 of 5 Stars!]