ART. PN-RZ HINGES FOR CONCAVE EXTERNAL SURFACE Hinges with low aesthetic impact and easy assembling and composed movement for the opening of big shutters with concave external surface. the hinges PN-RZ combine in one body a device able to define a particolar trajectory that allow the opening of shutters with concave external surface preserving agood guide of the door/shutter without having recourse to the use of mechanic devices of connection and balancing. As optional they can be provided with shutter sensors "open/close" and with oildynamic device of safety locking during the sailing. Please contact our Technical office to customize some details.