Zinc plated assembly bolts and nuts * The Universal Adapter Plate can be used to mount Coronados, Bellevues and Avalons to a side support arm * Universal Adapter Plate can also be used to mount Coronado, Bellevue, Avalon or Oasis Mailbox onto a 4x4 wooden post * Works with 5100, 5500, and 6200 series mailboxes. Also works with 5515 post, 6215 post and 4x4 wooden post * 9"x6.5"x1"2lb.