Through The Door Key Drop Box, Heavy Duty Steel Through the Door Mailbox with 12" Combination Lock, Mail Drop Box, BlackProduct Features Rainproof Design Our through the door key drop box features a secure rainproof design with a large flap positioned in front of the delivery slot, ensuring the safety of important mail even during heavy rain. The bottom of the box is equipped with rubber pads and drainage holes to quickly remove any accumulated water, preventing mail from getting damp. Large Storage Box & Slot The through the door drop box includes a 12 x 6. 1 x 14. 1