Hi Stig,
You can find option contract specifications for STW here ( Options over the StreetTracks S&P/ASX200)
It looks like (I don't trade options myself and don't encourage others to either) for the indices, it's one for one thousand (1:1000) which is the same for shares.
Theoretically, it should protect you 100% but there are a few variables which may come into account so they'll probably protect you 95% to 99.9999%. An example would be the 199th stock moving in and out of the index asx200 quicker than it does with STW200. In a non-weighted scenario the difference would be 0.5%, in a weighted scenario (eg, asx200) it's probably closer to 0.1%.
Good luck with it and read up as much as you can.
Cheers,
Dan
PS Before trading in derivatives make sure you understand what you are doing. If you don't understand what your doing, don't do it. If you do understand what your doing speak to a derivative specialist before making a derivative position decision.
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