Comparing them to a known size is the best way but here's a guide I've used to sort out unknown sizes. Don't remember where I got it, but it seems close.
size - height - diameter
2/0 - ...
Type: Posts; User: flyfisherjoe
Comparing them to a known size is the best way but here's a guide I've used to sort out unknown sizes. Don't remember where I got it, but it seems close.
size - height - diameter
2/0 - ...