I have a small metal shelf with round feet that I wanted to replace with casters. The threaded post on the feet seemed to be the same size as the post on these casters, but the threading was actually slightly different, so I couldn't screw them in farther than a few turns. Luckily the casters came with thread sprockets (which wasn't in the description, so it's hard to say if that will always be the case, depending on who fulfills the order). So, once I was able to remove the existing thread sprockets (which was a bit of a challenge!), everything fit together as needed.The other issue was that this set didn't come with a wrench tool, and without one you can't really get any leverage on the caster to tighten it fully. I had several of these things lying around from various other furniture assembly projects, and thankfully one of them was a good fit. I wouldn't have been able to tighten the casters without this.Now that they're installed, the casters seem very smooth, quiet and sturdy. I suspect they will last longer than the metal shelf I put them on! :D
Rating: [4 of 5 Stars!]