This allows spreader bars to become 2-3 times larger than the collapsed length allowing the user to have a much more versatile lifting device. By constructing the spreader bar using hollow structural steel material you can get two or more pieces to slide inside each other. The second difference is that spreader bars can easily made to be telescopic. This upper rigging comes at a cost for the equipment but also requires a lot more hook height on a crane to lift a given load. The downside of spreader bars is that they require upper rigging. This effect makes spreader bars very efficient at transferring loads and have a much higher capacity then lifting beams for their given size. A spreader bar has a very elegant mathematical solution that eliminates opposing loads causing it to act like a pure column. The main difference between the two comes down to the engineering.
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