They have no bearings from what i can see in the 2 busted wheels. I have a lot of polyurethane wheels carts, and while the locking mechanism is cool on these wheels, the wheels themselves provide a rough ride.

All works smoothly. They extend a bit further in work area.

The frames, the hardware and the wheels are much beefier, heavier and stronger. I have a huge quartz work bench that probably weighs 300-400 pounds. Bought these for a router cabinet/bench.

You can eyeball/measure the install location by visually inspecting the mechanics of the foot lever. Predrilling the screw holes is needed.

They tend to drop to the stationary position when i move the saw. When i raise my bench they are not perpendicular to the floor. No measurements or even suggestions on instillation height.

What a bummer. Only for the purpose of saving other people money aggravation and possible injury.