How To Make My New Mail Slot Burglar Proof?

Cutting out an opening in this steel door for a mail slot for one of our door slot The letterbox flap is attached to the door and thus enables letters to reach the vestibule directly It is made of 2 mm thick polished stainless steel V2A door mailbox slot HEAVY DUTY solid brass material mail slot to provide long lasting durability FIT door thickness 1-34 with included inside stainless steel sleeve

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