Best Price Mattress 14 Inch Metal Platform Beds w/ Heavy Duty Steel Slat Mattress Foundation (No Box Spring Needed), Queen, BlackBest Price Mattress metal platform bed frame/foundation is a complete support system that replaces the need for the traditional box spring. It is constructed with 100 percent steel to provide maximum support and durability for long lasting use. You will find that its 9 points of contact from the mattress to the floor adds strength, stability and level support. Another feature is the 12 inches of under bed storage to keep those needed items conveniently stored away.