Step 1: Pick Your Newel Post Pick your stair railing post that provides the structure of your railing. 3 1/2” Plain Chamfer Post 3 1/2” Plain Post (4002 ) 4 1/2” Post Double Cap (4591 ) 5” Plain Post (5091 ) Step 2: Pick Your Rail Profile 684 Rail 6010 Rail 6210 Rail 9200 Rail “Code” Rail