Spider web granny square could be made with any yarn you have.
I used Sport weight yarn and crochet 2.5mm hook. You can use 3mm crochet hook for it, the square will be a bit bigger.

The pattern includes:
-step-by-step written instructions, accompanied by pictures,

• clear colorful chart,
• assembly diagram with instructions,
• video link on how to make a Magic Ring,
• eight pages total.

Pattern in American English terms.

The square size perfectly matches to another Halloween patterns I’ve made:
Pumpkin Cat granny square, Ghost granny square, and Witch granny square. All these squares have exact same square size and could be used in the same big project.