The BuildPro Leveling Casters can make your table both fully mobile and stationary. These compact, heavy duty units bolt onto your table legs, raising the working height by approximately 5 inches. Leveling is accomplished between the leg and the caster. Simply turn the thumb wheel to lower the wheels for easy table movement. Each caster has an 1100 pound capacity. 47 inch long tables require 4 casters 78 inch and 94 inch long tables require 6 casters Warranty: 1 year manufacturer's warranty