1.Can decrease pressure on the surface because of wide loading syrface 2.When lifting the body whose outer surface in smooth and delicate,the sling does not damage the lifted body. 3.As usual,polyester sling is used to the acid environment,polyamide sling the alkali enviroment,polypropylene sling owns resistence to the acid,alkali and most chemical conditions. 4.Can append the hardware fixings.