This post should be used with Supreme Letter Lockers or Armadillo Mailboxes that will be installed directly into the ground with a concrete pour (similar to a fence post).  

Steel:

• Constructed of .075 Steel
• Surface Mount Posts include a 1/4" top plate
• Measures 4" Round

Please use the table below to find what post should be used for your setting.  

Printable 36" In-Ground Aluminum Post Specifications

Letter Locker® In-Ground Post Installation Instructions