I built a stool for my workshop that I use all the time. This stool walks on a concrete surface, usually sprinkled with sawdust. I've tried several sets of 3" casters and found that they fail most often in the upper bearing area. The stamped ring holding the slewing bearings flexes slightly, causing the bearings to fall to the ground. This model has withstood the flex in that area and continues to perform great.
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