made of a 1-5/16″ mitered aluminum extrusion flange and 1-1/2″ d mounting frame doors for long lasting durability. Design provides architecturally pleasing appearance. Door panel lined with 3/4″ polystyrene insulation. All aluminum construction ideal for exterior applications and specific interior applications requiring corrosion or moisture resistance. Door size is 18″ w x 18″ h . Number of latches is 1 . Color finish is silver .