Reference the meeting date 10 / 8 / 2558 steel plate a certain size and width. We are not easy to lift to harnesses. Because the hook we use different with its customers. Consented to the place to which each layer overlap does not exceed 3.5 tons (see the picture we put 4 layer). And that does not use wood vice between layers. To prevent a height too. In order to prevent the accidents during transportation.