Measuring 3.3 metres long, these Westminster Parallel Bars have double rails on each side, one pair on top and a height-adjustable pair part way down.The lower set can be set to heights between 670mm - 830mm (26.5\'\' - 32.5\'\'). This makes them 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 longer model is available and either 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.