We can only describe this as a side release cord lock. The parts come preloaded with the hole in alignment, which makes it significantly easier for factory operators to install the cord locks onto garments, sleeping bags or backpacks. By simply squeezing the sides after the cord has been passed through the holes, the locking mechanism springs up pinching the cord. The all-stainless steel spring offers a 30% stronger lock than other competitive versions and although the Pop-Lock® is compact in size, it affords a larger opening to accommodate larger cords.