Kings Brand Furniture 30" Black Metal Day Bed (Daybed) Frame 30" Black Metal Day Bed (Daybed) Frame. Easy to assemble. Includes platform with metal slats, (No need for a box spring or separate bed frame.) Dimensions: 77" L x 30" W x 17' H. The Mattress is not included it could be purchased separately. Please note that this bad does not use a regular twin size mattress , it uses a 30 inch mattress.