FLAT Equalizers stabilize existing wobbly tables following a gentle press on the table top. Simply remove your table's existing screw-in feet, check their thread size (1/4", 5/16" or 3/8" threads available), and replace them with the equivalent sized Equalizers. Equalizers use FLAT's award-winning hydraulic technology located within each foot and adjust to uneven surfaces. Equalizers also aide users when aligning multiple adjoining table tops. Each pack contains 4 Equalizers; they save users time and improve their customers' experiences.