The aircraft cable we use is stainless steel also. I'm sure you can get other materials. Its seems like its rated at like 15000 lbs. Prolly around 3/8 size. I'm sure someone will look up a chart but I can tell ya for sure. Its strong enough for what your doing. You stated in another thread you have rebar anchored in. I would wrap with garden hose like toy was saying and go for it. Not sure how many years it will last but I'm sure it's in the double digits.

The people who say I can't do it can just sit the @^#% down and watch me. Friends call me Rusto I also subscribe to pond boss mag. http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=504716#Post504716