... ladder Product instruction: Design, manufacture according with ISO5488-79 and GB/T14360-93aluminum structures, light in weight, high strengthCurve ... parameters, please refer to the gangway Model Size Table Model and Dimension For Accommodation Ladders stepsL(mm)L1(mm)L2 ... a ladder)l Turnover device (upper platform, Driving tube, lazy arm, pillar)l Fastening device (Fastening device, Fastening hooks, ...