Indalex 16 - 22 Steps 135kg Rated Industrial Aluminium Extension LadderIndalex Industrial Aluminium Extension Ladder Features Anodised for better corrosion resistance and lower retention of dirt and grime 3 piece strong rung joint for anti twist performance Base section on the outside for a safer descent Automatic ladder lock for safety Two rope design for complete control of extending and lowering the ladder Heavy duty I beam side rails Equal width base and fly sections stiffens the ladder and gives you equal standing