These innovative bed glides eliminate the need for antiquated bedframes. Child-safe, with no protruding metal parts; these bed glides are made of durable, high-density polymer and made in 4 different sizes so you can select the height that is needed! Enable housekeeping to rotate mattress and boxspring as aunit. Reduce excessive packing waste. Save time, money and manpower on handling and assembly. Trust our high-density polymer construction Replaces 3670040