Top of the line. Available in wood or steel. The best built, largest opening and strongest slides! Operates smoothly, prevents sagging or binding and allows a wide range of leaf openings. Available in wood or steel. Set consists of two slides. 20" slides for small rectangular tables. Gives maximum opening of 26 or 50". 36" slide for large rectangular tables. Gives maximum opening of 38 or 64". General rule of thumb - he length of the closed slides should be at least 2/3rds the length of the closed table.