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Twin needles come in different sizes like other needles but you will notice above that there are 2 numbers in the size.

* 1st number = distance between the needles (measured in millimeters--mm)
* 2nd number = actual size of the needles

The first needle above on the left is a twin needle size of 80 with 2.0 mm between the needles. The second needle on the right is a size of 75 with 4.0 mm between the needles. (I used the 4.0/75 needle for the demonstration below. I liked the spacing better for hems.)

Even though each needle will get its own thread, only one bobbin thread is used. One needle is slightly shorter than the other so a single bobbin can pick up both threads.

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    Dec 31, 2009, 12.44 AMby fleurdelis

    Stretch needle, heh, for knits. Wow, am I disappointed with the help I got at the sewing store. I am sewing a silk top for a duvet and want to twin needle the seams. I have been using a ball point needle for regular seams because a regular needle causes the material to ladder. When I bought the twin needle for the top the salesperson told me they did not make twin needles for knits. Looks like I won’t be going back to that store.

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