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I was skeptical about running two threads through one needle, but these handled it without any fraying or skipped stitches. The extra groove really does make a difference for thick topstitching thread.

The extra-large eye on these needles makes it so easy to load two strands of regular thread for a bold topstitch. I’ve been working on a denim jacket and the size 16/100 handles the thick fabric without any skipping. Exactly what I needed for visible stitching that looks professional.

Finally got topstitching thread through a needle without splitting or fraying—that big groove really does the trick. Used it on denim and the size 16 held up through the whole seam.