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We use these on our farm because they can be left dummy locked for access by others and then they can close them after they are done - or at least they used to be able to. The newer locks very quickly bind up internally and cannot be closed unless the combination is rolled it - defeating the pupose of using the locks. I've tried lubrication with no success.
We use these locks outside and they are out in the weather 24/7. We have some older locks and they look to be SOLID BRASS. We had to replace one of the locks because it was getting so corroded that it wouldn't work anymore. The new lock looks like it is brass plated like the one it replaced. The locks that look to be solid brass will last for years outside.The new lock, after only a few weeks outside, looked as bad as the one it replaced. I am no metallurgist but it looks to me that these are not solid brass. Maybe there is a model that is solid brass? These locks would work good on like a gym locker.
I'm buying another of these because the Sesamee K0436 4 lock that i bought seized up after 2 months outdoors (rain only, no cold). The Master Lock 175D, that I have used in the past, has a longer life span (perhaps a year) before it fails. No combination lock seems to be really good outside.