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The safety factor of disposable sling is 6 times, and the strength of sling is 6 times. Therefore, the high-strength, thinner sling is used, but the anti-wear performance is not considered. In principle, the disposable sling is used for lifting the finished product. It does not need to be reused with the supporting use of the product, and many customers just use it to hoist semi-finished products until the finished products are produced, hoisted to the final customer, and recovered for reuse. This has a great safety risk.