Aluminium rung extension ladder with sturdy rectangular tube stiles. It features ribbed square rungs measuring 30 x 30 mm on both sides and a 4-fold flanged rung/stile connection. The ladder allows for easy height adjustment from rung to rung, thanks to plug-in hooks with an automatic locking anti-lift device. The top ladder from size 2 x 14 rungs includes wall rollers and has 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 crossbar). The maximum load is 150 kg. The standard crossbar has non-slip ladder shoes in optimum width for safe standing and climbing on single ladders over 3.0 m. The traverse is supplied loose and is screwed twice to the lower end of the stile. Note: According to the standard, the attached extension ladder section cannot be separated from the ladder for lengths over 3.0 m.