FlexFit Retainer Bar, Qty 1:
Fits Twin, Twin XL, Full, Double, Queen size mattresses.
Includes 1 metal retainer bar and hardware.
FlexFit Retainer Bar, Qty 2:
Fits King, California King, Split King, and Flextop King mattresses.
Includes 2 metal retainer bars and hardware.
Compatible with FlexFit adjustable bases sold after 2011.
Not compatible with Precision Comfort