IDL-17 可依不同的线、布料与针距搭配出多样式的贝形花边，藉由移动针数调整杆，便可变换2种不同的针织样式，共有3针或6针之贝壳饰缝。
IDL-17 is made in various specific style for producing shell stitch edge finish of different sizes, and to produce any one of the two different combinations of finishes which
include 3 or 6 stitch.
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