This is a set of brass plated bi-fold door hinges. They are the non-mortise style used by a variety of bi-fold door manufacturers. Made of stamped steel, the hinges have a cut-out that allows for the non-mortise installed.
This bi-fold door hinge is constructed from steel and comes plated in brass. It has a cutout to allow for non-mortise installations. This hinge is used by many wardrobe door manufacturers.