Needle size chart More
Japanese crochet hook chart. Should help a lot with those Japanese crochet books I keep buying =)
crochet hook sizes and conversions | Free Patterns to Crochet - Crochet Patterns - Yarn Stores Online
Crochet hook size 101 for beginner crocheters by Articles of a Domestic Goddess http://articlesofadomesticgoddess.com/crochet-hook-size-101/
How to Crochet: Choosing the Best Crochet Hook Sizes
Crochet Hook Size Guide at Good Ideas for You
This crochet size and weight infographic details all the different yarn weights and the specifics of each. It breaks down the yarn type, weight, wraps per inch and ply. This infographic also includes a chart of different crochet hook sizes.
Crochet Hook Size Reminder Charms - never forget what size hook you were using for a project!
Crochet Yarn Weight Conversion Chart. Helping you to work out what weight of yarn to use for your crochet pattern, and the right crochet hook for that yarn.