The double doors are equipped with bolts on top and bottom to build in the edge of the door. The body of the bolts is made of stainless steel AISI 304. The operation of the bolt is so easy, using a lever mechanism, which also is made of stainless steel. The internal mechanism, with a spring, activates the steel pen. The upper bolt is provided with flat striking plates, the lower bolt with socket in chrome plated brass, whose plate is mounted on a spring to prevent pollution of the whole.