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)
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)