Kings Brand Furniture Black Metal Twin Size Day Bed (Daybed) Frame with Pop Up Trundle Kings Brand Furniture Matt Black Metal Twin Size Day Bed (Daybed) Frame With Pop Up Trundle. Creates additional sleeping space for house guests and visitors at night, while during the day, it can be used as a sofa for watching TV or reading a book. Includes platform with 7 metal slats, (No need for a box spring or separate bed frame.). Dimension: Day bed: 80" L 43" W 45"H. Trundle: 75.5 " L 39". Simple assembly required. Mattresses are not included.