Knob and latch combined: - Knob is flush when pushed in and not in use. - Knob pops out when pressed to open the door. - Door will be locked when knob is pushed in Door Thickness: 15 mm~25 mm (19/32"~ 63/64") Holding Force: 10 kg (22 lbs) Non-Handed: Can be installed on left or right side Other ring shape available. - Oval: DPL-OV - Square: DPL-SQPUSHWARNING: This product can expose you to cadmium, 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.