The Woodgrain Millwork 1-1/16 in. x 3-1/2 in. x 88 in. RB03 Pine Casing is used around doors and windows to cover the gaps between the frames and walls. Pine RB03 Casing is the finishing touch on any window and door. You can combine casing with a backband to create a bold one of kind look. Color: Unfinished.