187793 Solar Group GCL10000B Classic, Standard Rural Mailbox and Post Combo, Black. Constructed From Durable, Rust-proof Plastic. Double-Walled Construction Provides Extra Strength. Includes Mailbox and Mailbox Post Sleeve Conveniently Slides over a 4 4 Wooden Post for Quick Installation. Features a Safety Rear Door for Mail Access Away From Traffic Areas. Includes Plastic Outgoing Mail Flag. Product Assembly is Required; Mounting and Installation Hardware is Included. 4 4 Wooden Post Sold Separately.