We purchased these wheels to replace the stock wheels on one of the popular, 6’x4’ scaffolding towers currently on the market. In the OLD wheels, a small piece of gravel had become lodged in the brake mechanism, allowing the break to appear disengaged, but the teeth that prevent a swivel were still engaged, and applying side force to the unit snapped the stock rubber wheel flat in half.These wheels have a metal core, and are 2” taller, so I don’t expect that will be a repeat issue. They do not run silent—there is a metallic clink from the brake/swivel mechanism when rolling and turning, but it’s not that bad. The brakes are also a bit harder to release and often require a hand to take them off, but overall a good set of replacement wheels at a great price. Would buy again.