Concealed hinges for flush doors The CDS concealed hinges represent an highly advanced and highest quality of hinges and are designed and created for the flush doors. Combine the high quality of materials, optimum functionality and aesthetics, satisfying every need. A big range that allows to make flush doors and entrance flush doors from 40 to 300 kg of weight, even Fire certified. Reduced bodies of the hinges maintain functionality even if used on doors from heavy loads. All the forces acting on the guide kinematic converge on horizontal axes, thereby ensuring maximum reliability. The joint four-link, which connotes all hinges CDS, works draw. In this way excludes the warpage and deflection of the hinge. Strength, functionality and aesthetics, all in an hinge.