A crochet hook (or crochet needle) is an implement used to make loops in thread or yarn and to interlock them into crochet stitches. It is basically a round shaft pointed on one end, with a lateral groove behind it. The point eases the insertion of the hook through the material being crocheted and the groove makes it possible to pull a loop back through the material. The shaft is then divided into a working area that determines the hook's nominal diameter and ensures the uniform sizing of the loops formed on it, and a handle.

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Plarn is a plastic yarn made from used plastic shopping bags. It can be woven, knitted, or crocheted into mats, rugs, curtains, etc using a size J to N hook.

• Parametric Crochet Hook

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• Wikipedia: Crochet hook