Side mount  Square Newel post, complete with lateral flange with 4 holes for 3/8” dia. screws. Material : Stainless steel AISI 304 grade for interior use. Satin Finish.  Post Dimensions : 1 -9/16”x 1 -9/16” sq.Flange dimentions  3 -15/16”x 3 -15/16” x 15/64” thickness , 39 -3/8” H .