Knob is stored flush when pushed in and not in useKnob pops out when pressed to open the doorLatch securely locks the door with deadboltDoor Thickness: 19 mm~30 mm (3/4"~ 1 3/16")Holding Force: 20 kg (44 lbs)Non handed Order Latch Body (TLP-LB/WHT or TLP-LBM/WHT)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.