Lifting sling 1) Material: polyester fiber 2) Safety factor: 5:1, 6:1, 7:1, 8:1 3) Work load ... limited: 0.5 - 100MT Lifting slingPatent Number ZL 2006 2 0019175.8 Webbing ... 's requirement, the safety factor of sling has 4:1,5:1,6:1,7:1,8:1, its load range ...