Unlike the flat cylindrical tubes of traditional needles, two serrated shanks form their needle's exterior, while a central shaft slides between.
和平滑的圆柱形传统针头不同，这种针头的外部是两段锯齿条，中空的部分可以在锯齿条之间滑动。
Unlike the flat cylindrical tubes of traditional needles, two serrated shanks form their needle's exterior, while a central shaft slides between.
和平滑的圆柱形传统针头不同，这种针头的外部是两段锯齿条，中空的部分可以在锯齿条之间滑动。
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