Schroth's street legal harnesses have loops sewn into the end of each adjusting strap. These are plastic dowels that can be put through those loops to give something firm to grab on to when adjusting the belts. This really gives you an advantage when the temperatures are high, or when you're wearing gloves. It makes it much easier to get the belts as tight as you should be wearing them.
Sold in sets of four which is enough for one street legal harness.