Base Block is 6-1/4 inch wide. Trunk is 4-3/4 inch wide. Raised Panel is built using true stile and rail construction, not just a routed out design that gives the illusion of a raised panel box newel. "Pyramid" peak style cap available at no extra cost (just make a note in the checkout section) or contact us to place the order. - See more at: https://www.stairparts.net/2/2848_6-1-4-inch-Box-Newel-Post-Raised-Panel.html#sthash.iJJGigba.dpuf