The Woodgrain Millwork 11/16" x 3-1/2 ". Primed Finger jointed S4S moulding can be used for a wide variety of projects. Primed Finger-jointed 1x4 S4S moulding is great for constructing cabinets or bookcases. Some S4S mouldings can be used as balusters to support hand rails. S4S is also a great addition to many moulding combinations.