"The March Interlocking Crochet Square is made using interlocking crochet in the round. This pattern is free on the blog, including written instructions, charts (both plain and annotated), and a complete video tutorial walking you through each stitch of this pattern. You will need two colors of yarn, a corresponding crochet hook, and two stitch markers. Working in worsted and an H hook, the square will measure 9-11 inches, depending on your yarn and your tension."