DBIM-8007_Walnut-Walnut Modern Interior Door Custom Modern, Single Solid Core, Flush Interior Door. Available in Regular or Rift Cut Mahogany, Oak or Walnut Wood Veneer. Prefinished in Walnut, Espresso, Coffee Bean, Earth or Chocolate Stain. Comes with concealed hinges, magnetic lock, adjustable jamb and matching or white casing. | Doors for Builders is a leading supplier of modern interior doors of superior quality. Custom interior doors are designed and crafted in any size.