what i like to do is go to home depot get about a 4 foot piece of cable thicknesss of your choice buy the collar pieces to make a loop and just use that.. the collars are the one's you squeeze. i use a vise. good luck.
I've used chain in the past with a ring welded in one end. The chain is too large to cut with anything but the biggest bolt cutters. Where I can ride a 4 wheeler to the location I'll continue to use chain, however, where I have to hump in, I use cable. I had been using the storebought cables already made up with eyes. The make your own idea from Mike88 sounds better. Would probably go to 6' in my location to acommodate 2' diamenter trees.