Plate and stopper form a set to control the swivel angle of HG-S swivel torque hinges.Two swivel directions (clockwise and counterclockwise) and five angles (30, 60, 90, 120, or 150).WARNING: This product can expose you to chromium, nickel, 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.