Hinge is completely hidden when the door is closed Torque decreases as the opening angle increases, making easier to open the lid (refer to "Torque Curve" at the lower left) Use with top-opening lids (opening angle 0~100) (free stop range) Non-friction torque type also available Operating temperature: 0?~40?WARNING: This product can expose you to cadmium, hexavalent chromium, lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65WARNINGs.ca.gov.