Review on Aozel Threaded American Locking Casters by Mason Gordon

I installed these 5 inch rollers on a large tool box that weighs about 400 pounds. When installing the boxes, one of the rollers on the bar under the nut broke. I figured this must be some weird 1/2" stem accident. Finally, each caster is rated for a 500-pound load capacity. When I tried to move it, the other pulley broke in the same spot on the bar and the box fell over, hitting me with boxes in the process. They are NOT rated and if you try to mount them on something heavy it is downright dangerous. Spend the extra cash and get something that might not kill or maim you.