Crochet hook, Clover, steel and resin, 5-1/4 inches with #10/0.75mm hook, fits thread size 50-80 and dead-soft wire gauge 30-26. Sold individually. - Fire Mountain Gems and Beads
understanding crochet hook sizes - YouTube
Crochet Hook Conversion Chart - metric, US letter and number and UK old sizes
Amazon.com: Yarniss 14 Size Crochet Hooks Set,MultiColor,2mm(B)-10mm(N) Ergonomic Crochet Hooks with Case for Arthritic Hands, Extra Long Crochet Needles