Learn how to join granny squares with the flat slip stitch or zipper join. The flat slip stitch join or zipper joining is a granny square joining method using your crochet hook. It makes a flat and very beautiful join that reminds the look of a zipper. Unlike the single crochet joining, the zipper join does not add any bulk to the final project. Moreover, the slip stitch join is done with a crochet hook! No need to seam pieces together or make estimates of how much yarn you’ll need.
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