With their attractive design, hinges GN 138 are suitable for use in plant and machinery where a well-designed and stylish appearance is important. The concealed and tamper-proof mounting from the rear highlights and enhances the special appearance of the hinge. The dimensions l1 / l2 and the drill hole spacings m1 / m2 match the usual hinges GN 237 / GN 237.1 and can replace these.