Semco sliding patio doors feature factory applied, concealed tandem rollers with level adjusters for easy operation. They are available as clad with heavy-duty extruded aluminum in a wide selection of standard and custom colors or as wood exterior units with high-performance white latex primer. Standard glazing features dual-sealed 3/4-in. insulated glass and warm-edge spacer bar. Low-E, Argon gas fill and tinted glazing options are available.