Clover Latch Hook Eye Darning Needles - Clover has done it again! They have come up with something very handy to have. The Clover Latch Hook Eye Darning Needles has arrived! If you are a machine knitter, you already know how a latch hook works. The yarn goes into the hook of latch, the latch closes over the yarn and you then pull it through your knitting. If you have trouble threading a needle, this makes it easier. You can even thread multiple strands of yarn or thread (for finishing surged seams). The latch stays closed when you press it down to keep the yarn or thread inside the "eye".