a28cd882_pes_And_Sizes___Sewing_Insight__Description
[Needle Type] Self threading [Use] General use – seams, hemming, attaching buttons [Description] 
Self threading needles vary in length and thickness. The primary difference between these needles and all others is that there is a slit at the eye to allow thread to go into the eye without having to be threaded as with traditional hand needles.
Sewing Needles Types And Sizes | Sewing Insight
Description