Also known as a reverse single crochet, backward single crochet and the pie crust stitch, the crab stitch creates a cord edging for your crocheted projects.
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Normally, I work from the right to the left so I would be crocheting my single crochet in that direction also. However, for the crab stitch, I’m going to work in the opposite direction. (Right-handed individuals work right to left normally, but now you will work left to right. Left-handed individuals work left to right, but now you will work right to left.)
Continue making a regular single crochet, just reverse the direction. Go under the two top loops of the stitch to your right (for right-handed) or to your left (for left-handed). Yarn over and pull through so you have two loops on your hook. Yarn over and pull the two loops on your hook. Continue working this way around your crocheted project. As you work, you will see a cord edging form. It is very easy to do and it creates a simple but attractive finish to any crocheted project.