These wheels look pretty stout, I love the way the shroud covers the bearings. It will be really hard for something to get into the roller bearings. The one thing that kept me from rating this a 5 was there were no specs for the size of the threaded shaft. I assumed it was a 3/8 shaft and had welded ends on my table legs as such only to get the wheels and find they have what appears to be 7/16 threads or could be metric. I am pretty irate since I have to cut off the end of my table legs to accommodate the larger size (another 2 hours of work plus material). I will go to a hardware store to find out what nuts fit the stem.