The Woodgrain Millwork 19/32" x 2-1/4" x 96". Primed Medium Density Fiberboard LWM 442 Casing is used around doors and windows to cover the gaps between the frames and walls. Primed Medium Density Fiberboard LWM 442 Casing is the finishing touch on any window and door. You can combine casing with a back band to create a bold one of kind look.