It depends on how often you ride, but the tool will likely rust if left in the open. They all rust, regardless of the materials claims, even the best stainless and titanium will rust eventually if they are exposed to human sweat regularly. It comes down to the galvanic potential between metals when exposed to a fluid ion source. Even with a stainless fastener and stainless tool bits, the alloys will be slightly different and this will have a small galvanic potential difference. This difference will eventually corrode. If you don’t ride much, it is not a big deal. If you really want a long term daily solution, put it in a small saddle bag and inside a small sealed plastic bag.
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