Rev-A-Shelf - 4DMCB-15P - Medium Cabinet Door Mount Polymer Cutting Board (1) White Polymer cutting board , (1) Wood mounting rack with Chrome rails and mounting hardware Polymer cutting board Designed for a 12"opening Includes patented door mount brackets for up to 5" of adjustability (US Patent #: 7,204,569) Image shown is of 18" model. Actual unit is 15".