I used these to widen tires on a 400 lb generator. I received a set of bushings which I replaced with bearings. I had to deform the hubs a bit to get the bearings to fit tight. The generator no longer sinks into wet grass and I think they are good for non-powered applications but I wouldn't recommend them for a large mower or similar. It's hard to beat the cost when you need a new wheel and a flat tire, but you get what you pay for.