Bought these for a workbench I made for my new garage. The floor slopes very slightly from back to front and from sides to center for draining. I had the casters on wheels and just moving the bench several inches in any of four directions the caster legs would lightly touch the floor, and I had to raise them so the wheels would roll. The legs tighten very securely if I want the bench to be steady and secure. It is easy to adjust the caster legs to compensate for the tiny variations in bench legs that are off the slightest length due to my amateur caprpenter skills.