Galvanized metal table slides will rise in middle when opened to keep the table level after inserting leaves. These table slides have no pulleys and a 1/4" nut welded on for attachment to the pedestal cap. For use on 4 legged and unconnected pedestal tables. Table slide has 4 runners per unit x 3 3/8" unit width x 2" unit depth x 7/8" width per runner. Free installation instructions included.