Our Extreme bed frames are the strongest, most technologically advanced in the world. Mantua's Extreme frames provide perfect support for every sleep system. The patented level-design construction gives proper alignment and support of the box spring. This reduces wear on the box spring and the potential for noise. The frame's extra length eliminates tipping when seated at the foot of the bed. Extreme bed frames have a patented self-leveling, recessed leg design with wedge-notch assembly. This leg design provides stable footing on even or uneven surfaces and becomes stronger as more weight is applied. Recessed legs enhance appearance and improve safety. Finally, no tools are required for assembly, making setup quick and easy. The M60G fits California King beds and includes a double center rail for added stability. Six legs come steel stem glides to keep the bed from rolling.