Your wobbly table solution! No more bunched up napkins or wasted drink coasters. Got a wobbly table? Simply twist in these hydraulic self-adjusting table glides and save your table from the dumpster. available in 2 thread sizes and sold in packages of 4. Great for indoor and outdoor use, automatically readjusts each time the table is moved, and adjusts 5/16" on any uneven surface.