The Woodgrain Millwork 19/32 in. x 2-1/4 in. x 84 in. LWM 356 Primed MDF Casing is used around doors and windows to cover the gaps between the frames and walls. Primed MDF WM 356 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.