Good quality flat polyester webbing sling 1. CE,GS,ISO certificate 2. Safe factor: 5:1,6:1,7:1 3. Working load:1ton-30ton Good quality flat polyester webbing sling is produced from top quality synthetic fibre by advanced international level of weaving technology and equipment in various sewing methods. According to customer's requirement, the safety factor of sling has 4:1,5:1,6:1,7:1,8:1, its ...