Andersen Base 
9/16" X 5-1/2"

Andersen Base.  In-Stock profiles available in Red Oak, and Poplar.  Profile is available via special order in all other species.  

Knotty Alder lengths vary and are usually available in a mix of 9' and 10' lengths
Oak and Poplar lengths vary and are usually available in a mix of 12’,13’ and 14’