Don't recall ever seeing this before. While playing with my single line suspension I was having trouble with the prussiks for the tarp slipping and was looking for another way to attach the tarp to the SLS. Had a double loop dogbone of 7/64" amsteel laying around from a mini spreader bar experiment. I cut it in half and using my folded wire tool just pulled the tail of the loop into the 1/8" amsteel SLS. Did some pulling and tugging with no slippage so made a second set to attach my hammock to the SLS. Was leary at first but they supported my 220# with no failure, yet. Plans now to install 2 more in the SLS for a small gear hammock at the foot end.
Got a feeling that this may have many other uses.