OK...so I'll throw up a word or two here, also...I just got my first tarp hooks today. OK, so AVG Strength for 1.75mm Zing-It is 400lbs. Lets assume that the Elf's Zing-it was worn a bit and broke at 275 lbs. If the hook did not even bend, I think a safe assumption is that the hook has a MINIMUM breaking strength of 300 lbs. I have 3 tarps that are light weight or UL. None of those tarps could take a 300 lb load on edge( the direction that the hook pulls).
I am amazed at that when I hold this little doohickey in my hand!