I believe that the size is NM 150 which is a 22.5. So that is probably a good size for heavier thread. The LR needle has a slanted point and is to be used to sew decorative seams on soft to medium hard leather. I found this information on
https://www.thethreadexchange.com/mi...ode=NDL-717282 and
https://www.thethreadexchange.com/mi...ode=NDL-134-35
Janey - Neat people never make the exciting discoveries I do.
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ETA: The NM is a metric number and a description of needles for industrial machines can be found at
https://www.servicethread.com/blog/i...d-needle-sizes