Mantua's CraftLock® 133R Twin bed frame 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. Includes four legs with nylon rollers for added mobility. Two rollers have brakes to lock the bed in place.