The Quick-Sling® QSSX48-18 is a next generation Super Stand® extension kit with 48 in. cross rails and is 18 in. tall. Quick-Sling Super Stands are designed to provide a strong and stable mounting platform for VRF/VRV outdoor units. Extension kit(s) are combined with a Super Stand base kit (QSSBxx-18) to complete a multi-unit Super Stand.