Description This Pontalba Round Pole Mailbox Post Bracket is made from cast aluminum and available in 8 colors.  No specific mailbox hardware included.  Depending on your mailbox… you should be able to either drill holes in your mailbox floor… or  attach a wood mounting board to the top of this bracket for the transition piece to mount a standard style mailbox.  A handy person should be able to attach almost any mailbox to this bracket. Size:  approximately 12″ x 12″ Top of bracket hole pattern:  approximately 7″ x 3″ Replaces Imperial Mailbox “C” and “D” Series mailbox system components. In order for us to send the correct size bolts, select the correct outer diameter (OD) of your vertical mailbox post on the order form. Imperial Colors: Available almond, black, bronze, brown, grey, dark green, antique verde and powder-coated glossy white.