The Titanium Micro Hook is an ultralight (0.3 gram) device for rapidly connecting cordage to itself in a loop. 
Instead of wasting time pulling your cordage through a fixed loop or tying a knot, you can use this little hook instead. 
Simply attach it to one end of cordage, loop around something (like a tree or pole), and clip. That's it. 
Save time and eliminate fiddle factor when setting up a hammock tarp ridgeline, hanging your backpack, clothesline, lantern, or a gravity fed water filter. 
 
Works best with 1.75mm lines.