Double Doors - Hollow Metal PairsThe active door of the pair is typically prepped for a locking device, such as a lockset or exit device. The inactive door (or fixed door) is prepped for flush bolts (top and bottom) and includes an astragal, which covers or closes the gap between the edges of the doors. Exit devices or push pull hardware is required to make both doors active. Heavy Duty 18 Gauge Steel Rigid Honeycomb Core or Polystyrene Equal and Unequal Pairs Available