Polygon Ring with Side Car – Set of 2 This Polygon has a small utility ring welded to the inside. It is a popular SPG clip-off location with divers preferring to cross their chest with the HP hose. The Polygon effectively manages the intersection of the shoulder strap, sternum strap and lower chest strap. If you have ever struggled to don a harness that used 2" round rings at this location, you will enjoy the effortless freedom of getting into/out-of your harness. The sternum strap placement on a drysuit diver is critical. It should not interfere with access to the inflator quick release coupling. The ends of the sternum strap terminate in the Polygons, which are the landmarks around which the harness is constructed.