Milcor offers a selection of durable insulated hatches made of either galvanized steel or aluminum. The hatches feature an extruded polystyrene for higher insulation values than other hatches which means it is more energy efficient than other hatches that may use fiberglass. The Hatch Covers completely open to 90 degrees and is assisted by an enclosed torsion bar which ensures the cover opens easily. It also features automatic hold-open arms that keep the door opened securely.