This economical locking mailbox features an 18 gauge galvanized steel body and door for durability. It accepts larger pieces of mail and small packages. A convenient outgoing tray is also an internal baffle for added security and to keep unwanted hands from reaching into the mail storage area. Incoming slot: 10 inch wide x 1-3/4 inch high. Outgoing tray is 10 inch wide x 6 inch deep. Includes 2 keys. The post is made with 12 gauge standard steel and is 3 inch in diameter. The post and mailbox feature a tough Black powder coat finish to protect them from scratching or rusting. Post is 48 inch tall x 3 inch diameter and is direct Burial.