Crochet projects like laces or doilies are made from crochet threads or lace-weight yarns. And you need steel crochet hooks to make them!
Easy Guide to Crochet Hook Sizes (Free Charts) - Crafting Each Day
Understanding Crochet Thread Sizes
Crochet Hook Size Chart: Which Hook Should I Use? - Petals to Picots
Crochet Hook Sizes and Comparison Chart - Sarah Maker
BOYE STEEL Crochet Thread Hook Size 00, 0, Size 1, Size 2, Size 3, Size 4, Size 5, Size 6, Size 7, Size 8, Size 9, Size 10, Size 11, Size 12
Crochet Hook Sizes: Choosing the Right Hook Size
Crochet Hook Size Chart for Amigurumi: Absolutely Everything You Need to Know — Pocket Yarnlings — Pocket Yarnlings
Crochet hook, Clover, steel and resin, 5 inches with #2/1.5mm hook, fits thread size 10-20 and dead-soft wire gauge 30-26. Sold individually. - Fire Mountain Gems and Beads
The Differences Between US and UK Crochet Stitches, Hooks and Terms – KnitPal
Ultimate Beginner's Guide to Thread Crochet
Crochet Hook Sizes Chart and Comparison - Your Crochet
Understanding Crochet Thread Sizes
Know your Cotton Yarn/Thread/Hook