Casing 535 Call For Quote $1.23 Interior Door and Window Casing MDF, 11/16″ x 3-1/2″ View Product Catalog Casing 535 quantity Add to list Want a discount? Become a member. SKU: 535 Category: Mouldings Description Description Traditional casing MDF535 – MDF, 11/16″ x 3-1/2″ available in 16′ lengths OWS does NOT recommend installing MDF in areas prone to moisture (bathrooms, basements)