The Singer Twin Needle is 3mm wide and used for pintucks & twin needle stitching.
Twin Needle Sewing Tool - The Sewing Loft
Schmetz Universal Twin Sewing Machine needle
Shannon Sews: Twin Needles: double the fun
Threading Twin Needles
What is a Twin Needle and When Should I Use It?
Singer 2025 Domestic Twin Needles – Sew It
Schmetz Universal Twin Needle 4.0mm - Janome Sewing Centre Everton
12 Pieces Twin Needles, Double Twin Needles with Plastic Box for Household Sewing Machine, 3 Sizes Mixed 2.0/90, 3.0/90, 4.0/90
Quick Tip: Using the 2mm Twin Needle
Delicate design: each double twin needle is fitted with 2 needles, you can use straight stitch or pattern stitch with two different colors of thread
Twin Needle Double Needle Stretch Needles Stainless Steel Sewing Machine 15 Pack