"The Hookworm works the same as the Tarpworm, but the convenient hook means you can remove your tie-outs and simply hook them to a 3/32 shock cord loop on your tie-out points. They work best with 3/32 shock cord and they have just the right amount of click to make sure they are secured, yet they are easy enough to put on and take off.
Made by Dutchware and of course, Made in the USA."
The above wording is straight from Dutch, and his team.
You have the option of buying them made up as self-tensioning guyline, elsewhere on this website.