... treads with non-slip serrated rubber coating;Skin-protecting padding;Safety platform of diecast aluminium (25 cm x 25 cm);Attractive appearance ... High-strength Perlon belts prevent splay, fitted on all models of 4 rungs or more;Wear-resistant, anodized stiles.Specification:Overall ... back stay (mm)48 / 4248 / 4248 / 4248 / 4248 / 4248 / 42Number of rungs, incl. platform345678Weight (kg)4,96,07,08,29,310 ...