... , 30, 30.16, 32.5, 34, 40, 41.25, 45, 50, 60, 60.32, 80, 100Cross bar pith(mm)38 ... , 50, 76, 100, 101.6Thickness(mm)3mm ,4mm, 5mmMaterialQ235,SS304,SS316Surface ... of which 50mm and 100mm are recomended . safety steel step ladders with handrail