AINPROOF DESIGN: Safeguard your belongings from moisture with our spacious rainproof door mail slot! Bid farewell to damp and damaged mail, courtesy of the elongated hood, sealed frames, and rubber mat featured in this indoor mailbox with slots.It's good for putting on outdoor wooden doors, but not for fences. AMPLE STORAGE CAPACITY: Our door drop box boasts dimensions of 12''(W) x 4.25''(D) x 15''(H), providing abundant room to accommodate your mail, documents, checks, envelopes, as well as small items like keys and cash. It seamlessly fulfills your everyday storage requirements. STURDY MATERIAL: Made of heavy duty 1.5mm steel, this metal locking mail box is not only long lasting, but also provides great protection for your house mail, letter, envelope, money, check, and night keys for business office. UNIVERSAL DOOR FIT: Our lockable cash drop box is designed to effortlessly attach to wooden doors with a thickness of up to 1.75 inches, ensuring convenient access from both front and rear sides. All the necessary hardware is included for installation! (Please note: This secure drop box is intended for door mounting and is not suitable for wall installation.) SECURE ANTI-THEFT: Our deposit safe features a robust anti-fishing design, ensuring top-tier security. This slot-equipped dropbox safe is exclusively accessible using the designated key, and is impervious to forceful attempts at prying it open. BUILT TO LAST: Crafted from rustproof galvanized steel plate, this sizeable lockable deposit box is engineered for exceptional longevity. The powder coating finish not only enhances its durability but also ensures the longevity of your mail slots for doors.