aluminm wharf ladder 1.Aluminm step ladder of fixed type 2..Surface oxidation treatment 3.certificate supply aluminm wharf ladder desighed and manufacture according to ISO5488-79 and GB/T14360-93Aluminium construction ,light and hight strengthARC stept with antiskid groove Surface oxidation treatmentsupply CCS,LR,GL,BV,NK.....certificate typemain size(mm)LHhBB88000350200600B1010000400300B12. ...