The Dutch Hook is to the continuous ridge line what the Dutch Clip is to webbing suspension. It ties to the end of your 1.75 mm tarp line and you simply pass it around the tree and hook the line. A Dutch Tarp Flyz on the other end completes the ridgeline. You can also put the Dutch Hook on prussiks and you have a quick release to detach your tarp from your ridgeline. Sold Individually.