The VXK series of adjustable master links is truly innovative and sleek, and it's most notable with Quad Leg Chain Slings. Instead of using multiple coupling links, grab hooks and extra lengths of chain--all of which add to the sling's weight and cost--you can use one master link set that has all of those features integrated right from the factory. Furthermore, you have less mechanical components to inspect. For those that have performed chain slings inspections, you know this is a good thing. The difference is most notable on larger sizes of chain. For example, "old style" 1/2" and 5/8" quad leg chain slings are very heavy, even in short lengths. If you swap out your top rigging for one of these units, you will shed pounds immediately. VXK master links are available in single and double leg versions as well, though they are not as popular as these quad leg units. This is the new and better way to build a quad leg adjustable sling!