This door is made from a single piece of metal bent over twice on the edges to create a 0.625 inch thick panel. A reinforcing shallow rectangular bend of metal attached to the center of the vertical dimension provides extra bracing. Between this support and the vertical edges of the door are two pieces of fiberglass insulation glued to the door. The protective paint-like coating on this insulation is deteriorating. A handle on one side of the door is connected by cables to two latches, one at the top and one at the bottom of the door. NOTE: On the back of the catalog label is written "IBM?."