What is the door frame hole called ?

How To Open a Jammed Door Lock door slot lock Umiya Hardware & Glass - Offering Royal Stainless Steel RLK-4 Slot Type Mini Single Door Lock at Rs 2900 in Ahmedabad, Gujarat Also find Safety Door Lock door mail slot catcher The rears doors have a white key slot for the childproof lock The front & rear doors also have a black key slot What are the black slots

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