OTS ™ 634 allows normal door mounting; mounting on the outer frame is only possible using a block to limit the opening of the door. Usable on left or right. For doors up to 1100 mm wide. Seamlessly fastened to wooden, PVC, aluminum or steel doors. 180° opening and closing angle. Completely controlled closing from each opening angle. Safety valve on the door closer protects the overload. BLACK color.