Aluminium sliding rung ladder with sturdy rectangular tube stiles. Ribbed square rungs measuring 30 x 30 mm on both sides. Features a 4-fold flanged rung/stile connection. Simple height adjustment from rung to rung is facilitated by a plug-in hook with an automatically engaging anti-lift device. The top ladder consists of 14 rungs with wall rollers. It includes corrosion-resistant guide fittings and top ladders up to 3.0 m with nivello ladder shoes. Rung spacing is 280 mm and ladder width is 420 mm (without crossbar). The maximum load capacity is 150 kg. The standard crossbar comes with 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 secured 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.