Casing MDF, casing, refers to trim or molding made from medium-density fiberboard (MDF). MDF casing is commonly used in construction and woodworking projects to provide a finished look to door and window openings. MDF casing is known for its smooth and consistent surface, which makes it easy to paint or finish.

Casing MDF with a step bevel is a technique used to create a decorative edge profile on the casing or trim. This technique adds visual interest and can enhance the overall aesthetic appeal of the finished product.