Mantua's CraftLock® bed frame series uses a wedge-lock style leg that makes the frame stronger as more weight is applied. High-carbon, ribbed steel side rails provide maximum support for the mattress and box spring. Additional foot clearance is added with the use of our recessed leg design. No nuts and bolts mean no tools are needed for assembly. The 160R fits Cal-King beds and includes a double center rail for added support. Six legs with nylon rollers provide extra mobility.