 Crochet hooks and a darning needle are often useful in binding off or in joining two knitted pieces edge-to-edge.The darning needle is used in duplicate stitch (also known as Swiss darning), while the crochet hook is also essential for repairing dropped stitches and some specialty stitches such as tufting.Other tools such as knitting spools or pom-pom makers are used to prepare specific ornaments.