I was using 4mm coated wire or cable actually,On a Commercial Property where it is used as a barrier of sorts,Between a Railing & A Deck,It actually looks real nice,& lasts a few years in Salty ocean air,before it starts to deteriorate.I've seen Endcaps that crimp-on,I think they could be found on-line,& cheap,I'm sure.I didn't use them myself,I used a Dremel grinder to clean cut the ends,for a finished product!