Conversion Chart For Crochet Hooks

Japanese Numbermm
2/02.0mm
3/02.3mm
4/02.5mm
5/03.0mm
6/03.5mm
7/04.0mm
7.5/04.5mm
8/05.0mm
10/06.0mm
01.75mm
21.50mm
41.25mm
61.00mm
80.90mm