FOOT MASTERGDR-80-F-HUP-CUR-FBL Leveling Caster, 63 mm Polyurethane Wheel, Flat Black, Height Adjustable Ratchet, Plate Mounted Swivel Caster, 500 kg Load Rating

Wow... This looks like a great caster, but looks don't even come close to doing justice to its build quality. This caster will likely outlive me. Also: a non-obvious note about the ratcheting mechanism: that ring you can see is actually for a telescoping arm of sorts that pulls out from the caster to make ratcheting easier. Very, very well engineered item. I'm super satisfied!