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June 19, 2019, 11:14 a.m. -  Cam McRae

I thought there was a more specific term for that shape as well but E13 simply calls it a 1º P3 (for 3 sided) polygon. Other industries seem to use the same terminology.  The tool is specific to E13 and is used for some cassettes as well. It's included with the crank arms.  ![](https://cdn.shopify.com/s/files/1/0748/3595/products/CSH.UNVA-SPID.N_2048x2048.jpg?v=1453746429)

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