Compared to shackles of the same specification loads it is helpful to connect very compactly. We will be transitioning from wire to chain sling system in the future. The price is expensive compared to wire, but if you calculate durability as well, the result seems to be cheaper. It seems to be released from discomfort of injury by kink, yore, bending, beard (laugh) It will be quite heavy, but I always use it by lowering it to the hook of the crane so I do not feel the weight during work. Adjusting the length of the chain sling is very convenient using shortening etc.