The Inst-A-Matic® Heavy Duty Bed Frame w/ Rollers & Glides provides all of the features of the regular Inst-A-Matic® frame in a “one size fits all” universal design that fits sizes twin, full, queen, California king, and eastern king. The center support bar and 7 legs provide additional strength and include both rug rollers and glides. Like all other frames in our line, the Inst-A-Matic® heavy-duty is made of heavy-duty high carbon, recycled railroad steel with a water-based, lead-free finish.