Kings Brand Furniture Twin Size Day Bed (Daybed) Frame With Roll Out Trundle (White) White Metal Twin Size Day Bed (Daybed) Frame With Roll Out Trundle. Easy to assemble. Accepts twin size mattresses, Includes platform with metal slats, (No need for a box spring or separate bed frame.) The mattresses are not included it could be purchased separately. Dimensions: 77" L x 41" W x 17' H..