Measuring 4.8 metres long, these Westminster Parallel Bars have double rails on each side, one pair is set on top and a height-adjustable pair is set part way down.The lower set is height adjustable between 670mm and 830mm (26.5\'\' and 32.5\'\'). This makes the system suitable for use by people of different sizes and with different needs and conditions. The rails are mounted on a sturdy steel frame which can be fixed securely to the floor. Note that a shorter model is available and either version can be supplied with an optional base with ramps.N.B. These parallel bars are made to order and can take up to four weeks for delivery.