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. - Round: DPL-RO - Oval: DPL-OVPUSH