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nothing I can see on my bike
If you've checked properly, you can leave the T15 at home. It's not a common size for machine screws, the usual series is T10 for M3, T20 for M4, T25 for M5 and T30 for M6, but you will come across it if you have to dismantle things like power tools and kitchen appliances as it is used on some sizes of Plastite screws.
gbj_tester
hippy
T25 is on everything. T10 is on Garmin mounts. T15 maybe some disc brakes or something (nothing I can see on my bike anyway)?