Aluminium rung extension ladder with sturdy rectangular tube stiles. Features ribbed square rungs measuring 30 x 30 mm on both sides and a 4-fold flanged rung/stile connection. Easy height adjustment is possible from rung to rung, thanks to plug-in hooks with an automatic locking anti-lift device. The top ladder, starting from size 2 x 14 rungs, includes wall rollers and corrosion-resistant guide fittings. Top ladders up to 3.0 m come with nivello ladder shoes. Rung spacing is 280 mm, and the ladder width is 420 mm (without traverse). Nivello ladder shoes feature patented 2-axis tilt technology. The maximum load capacity is 150 kg. Note: Single ladders over 3.0 m may only be used without a traverse if they are used exclusively as intended, such as being permanently installed, provided with hooks, and fastened with a belt.