The Knickerbocker Monster metal frame is our top of the line frame for any size beds. All parts are made of thicker steel with rails 50% larger than other premium frames to increase strength. This extra strong frame also comes with a lifetime warranty. This frame has not 5, but 7 legs of support, to prevent sagging even with multiple people sleeping on top. If you need a heavy duty, durable frame, this will be the last one you ever need to buy because it can be configured to accomodate any standard size mattress box spring such as twin, full, queen, king and california king.