I had two 3 inch hard rubber casters that broke on a Harper hand truck (350 lb capacity) convertible model (hand truck and dolly). I've had a really hard time finding spare wheels this size with this load capacity and a 1/2" steerer, but decided to give these a try. Although these units are 4" wheels with a 1" shank, they fit perfectly, seem very sturdy and still allow for the use of a suitable carriage whilst maintaining a level position. My only recommendation is that they should be sold with a nut as these casters are required by the equipment I have.
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