Universal Forest 20411828 Standard Wood Mailbox Post 4x4x6 Standard post. Grade #2 and better, southern yellow pine. CCA-Type C, mold inhibitor. Pre-assembled for easy set-up. 4" x 4" wood construction. Mfg# 82897 4x4x6 Standard post. Grade #2 and better, southern yellow pine. CCA-Type C, mold inhibitor. Pre-assembled for easy set-up. 4" x 4" wood construction. Standard Wood Mailbox Post 4x4x6 090489100148