For the price, they seem pretty sturdy and rigid. I do have a concern with the swivel, they are a little stiff and hopefully will loosen up over time.

Easy to install, exactly what I expected

Nice rollers, used on a car rotisserie.

Front wheels get a little jammed when turning

Used on a engine stand I built for repairing a truck engine, do not swivel very easily but so far there holding up to about 3000lbs

Had these for about 6 months, put on bottom of tables for granite fabrication, so far so good holds up a lot of weight and keep rolling. Only one caster I had the brake fall off. Reason for the 4 stars.