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Freight elevator on the site of the mounting nut, sometimes not enough well-off, and tighten the nut wrench space is quite small. Hexagonal nut, one just need to flip the lever 60 degrees, it is possible to slowly tighten the nut,tighten the nut to the desired place set aside, hexagonal smaller, and therefore the most convenient to use the hexagonal nut.
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Look at cargo lifter wrench, a common wrench handle and pull the port can become an angle of 30 degrees, so that when the nut is installed on local cargo lift very narrow, not when the wrench can be free, and hex nuts, as long as the wrench flip a nut, then turn it over and then pull a wrench nut, so pull back and forth several times repeatedly, you can put a nut tightened.