Arm on 3 speed SRAM?

GordonFreeman
GordonFreeman Posts: 120
edited April 2019 in Workshop
I just took off the hub and detached all spokes to put stronger ones in and I noticed the 3 speed hub has a little metal arm. What does this do? It's not a coaster brake since the bike doesn't have the option....

Sram https://imgur.com/gallery/qK1SUti

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