https://www.amazon.com/dp/B079TFW124?... - Amazon
https://techteamproducts.com/product/... - Tech Team Website

When you have a garden gate with a dipping corner or a driveway gate that drags, the solution is Tech Team’s 00716 gate caster. It has a 4” solid wheel that rolls easily, supports the hinge post, reduces wear on the hinges, and it swivels 360 degrees on ball bearings. A compression spring adapts to uneven surfaces.