Schmetz Wing Hemstitch Needle 

1 needle per card.

Use with very lightweight thread (no fatter than a size 60 cotton thread - preferably size 80) and a hemstitch stitch pattern that has repetitive piercings into the same holes to create a hemstitch look ala your Grandma's hankies and pillowcases, and tablecloths...  

Using anything other than a VERY skinny thread - will just fill up the hole with the thread.