Shimano has been including the chainring lockring tool with M9100, 8100 and 7100 series cranks, but will eventually stop including it. I haven't unboxed an M6100 crank, but would be surprised if it was included, due to the cost of the crank being so low already. Small bonus, the chainring tool will also work on XT and Ultegra threaded bottom brackets, but the original tool for those bottom brackets does not work for the lockring because they do not fit over a 24mm spindle.
July 8, 2020, 7:55 a.m. - jyoucha
Shimano has been including the chainring lockring tool with M9100, 8100 and 7100 series cranks, but will eventually stop including it. I haven't unboxed an M6100 crank, but would be surprised if it was included, due to the cost of the crank being so low already. Small bonus, the chainring tool will also work on XT and Ultegra threaded bottom brackets, but the original tool for those bottom brackets does not work for the lockring because they do not fit over a 24mm spindle.