The Indalex PROX36 heavy duty extension ladder, with ladder leveler is designed to be a robust ladder, with minimal flex, for the highest applications. Part of the Pro Series range it is made from a high tensile aluminium alloy and using a 3 piece rung joint system to attach the D rung to the siderails, hence the best joining methods have been incorporated to sustain repeated use for years to come. An automatic latching and ropes system allows full and smooth control when raising or lowering the upper section