Schroth 2 bar slide, designed for use with 3" harness webbing. It's sole use is to allow you to wrap a 3" shoulder belt around a harness bar or pin for example and keep it tight once adjusted. It's lighter than a 3 bar slide and offers virtually no slip when wrapped correctly. Even a correctly wrapped 3 bar slide will has what is called microslip - when a small amount of webbing slips through the bracket when a significant load is placed on the webbing.
While this 2 bar slide is safer, it is much harder to wrap in if you are not used to doing it. Once you figure out the trick, it's not hard at all.
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