"The Dutch hook is to the continuous ridge line what the Dutch clip is to webbing suspension. Made of titanium this little mighty hook will hold up to the strongest winds and only weighs 0.4 grams. It ties or splices to the end of your 1.75mm tarp line and you just simply reach around the tree and hook the line. A tarp flyz in the other side 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."
 
The above wording is straight from Dutch, and his team.