The door is placed on the walls using door hinges. The hinges secure the door to the wall, protect the house from the external environment, and assist in the operations such as easily opening or closing the door. A door hinge is a type of home decor element. A double-folding hinge consists of a pair of metal or non-metal blades joined by a shaft pin. It is the part of the object that links two other pieces and allows it to move.