Hollow Core Black Composite Textured Double Bi-fold Door with Sliding Barn Door Hardware KitCALHOME bi fold barn door with sliding hardware kit contains everything needed to transform any doorway from a traditional door into a convenient, space saving and stylish sliding bi fold door. Bifold doors are folding doors made up of 2 pieces of door leaf's that can be folded when opened, maximizing the use of space. Compared to sliding doors and swing doors, bi fold doors can open a wider space while saving 50% of floor space (swing space), making