Why buy both a bed frame and box spring for your mattress. The sturdy steel SmartBase lets you enjoy the benefits of both; and fear not - this hardworking frame only requires opposable thumbs to set-up. Platform is made with heavy steel that replaces your box spring, allowing you to rest your memory foam or spring mattress directly on top; legs have plastic caps to protect your floors. UNDERBED STORAGE - Total of 13 inches of clearance space under the frame provides valuable storage room for extra odds and ends. QUICK, TOOL-FREE ASSEMBLY - Shipped in one compact box and requires no tools for assembly. MAXIMUM WEIGHT CAPACITY: 1500 lbs. DIMENSIONS: 54" W x 75" L x 14" H.