Handy Post for 3-Mailboxes Corrosion Resistant Paintable Vinyl Sleeve, White
It is designed to fit over an existing or new wood 4x4 (actual 3.5 in. x 3.5 in.). The cross arm is 31 in. across and 5 in. W and will accommodate up to 50 lbs. Features: Corrosion Resistant,Fade Resistant,Paintable/Stainable.