tool identification - Why are needles designed for sewing thick canvas or heavy leather three-edged? - Arts & Crafts Stack Exchange

Needles designed for sewing thick canvas or heavy leather (e.g. on a traditional sailing ship) have a triangular point, see example 1 and example 2. (These needles are sometimes also called “rigging

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What s the best needle for sewing through leather? - Quora

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Sewing canvas, not sure why my machine is stepping like this