I think I posted earlier that an auto parts store or a harbor freight will have a kit with all different types/sizes of bits for security screws for a 1/4" drive.... Your bit should be posts instead of small squares. We used those type and others Locksmithing, you know locking up the public toilets and such....
Yes, they can get real big. Those kits should have the size you're looking for though. That is approx the same as some of the locks we worked, I couldn't tell you a size. I would just try them until on e fir, sorry...
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