Dimension Closed : 12-1/2″ x 21-3/4″ x 5-1/2″ (318 x 552 x 140 mm) Open : 12-1/2″ x 21-3/4″ x 11-1/8″ (318 x 552 x 283 mm) Material Plastic Load capacity Unit supports a static load of 100 lbs (45 kg).