When locked it is firm, when unlocked it's a breeze to move on concrete floor. They are great and roll along just fine on the smooth concrete inside and on the brushed rough concrete in the driveway. Esta muy bueno.

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.