The BURG-WÄCHTER mailbox set Amrum 38670 Ni is made of stainless steel and sealed with a transparent protective lacquer. An integrated opening stop keeps the door open wide enough for you to comfortably retrieve your mail without it falling out. The slot is suitable for envelopes up to DIN C4 size. The mailbox complies with EN 13724. Two keys are included in the delivery. The mailbox does not meet Swiss postal standards.