http://www.handyhealthcare.co.uk/mobility-aids/clinic-furniture/suspension-and-bars/index.html extremely robust. The bars have a non-slip plastic laminate coating, and the base is hardwearing powder coated steel
and chrome, for durability.

The bars may be folded flat for
easy storage making them ideal for a multi-use therapy room
or gymnasium.

Height adjustment 69 to 100cm with easy to use locking pins.
Height 69 to 100cm.
Length 230cm.
Width 66cm.
Handrail diameter 45mm.]]> http://www.handyhealthcare.co.uk/mobility-aids/clinic-furniture/suspension-and-bars/parallel-bars-height-adjustable-folding.html