Tensioner suppliers different slings also have many classifications, hooks, clamping spreaders, lifting beams, grabs, lifting solenoids, lifting skids, lifting vacuum suction cups, container-specific spreaders and rigging. The requirements for obtaining slings are as follows: 1. The products must be purchased, produced and inspected according to national standards, and have certificates of conformity and maintenance certificates. 2. 2. Marked weight, production number, date of manufacture and manufacturer's name are marked on the obvious part of the product. 3. The contractor's own spreader management and use shall comply with the requirements of this article. 4. If self-made slings are required due to the production requirements of the tensioner manufacturer, the requirements and data shall be submitted to the technical department and the technical department. The technical department can confirm the permit before conducting tests and then use it before putting it into use. Before use, you should go to the safety department for record.