Gibraltar Mailboxes Drive-In-Post Galvanized Steel, Drive-In-Post Kit, SDPK0000 Compatible with all M and L capacity Gibraltar Post-Mount Mailboxes like the E1100B00 and E1600B00 Installs directly into the ground with no digging or concreting required All mounting hardware included Heavy-Duty galvanized steel construction provides strength and stability Black powder-coated finish is rust-resistant to withstand the elements