This very handy tool help to patching holes in clothes or threadbare areas. Run your fingers across the chain of hooks at the top to make the metal hooks flip one way and the other. This alternates the height of the warp/vertical threads so you can quickly and accurately weave over and under. A darning has two parts: a wooden disk and a . The wooden disk has a groove around the side so you can attach the to the disc using an elastic band. This design has 28 hooks, which helps you create closely woven darns using embroidery thread or similar. It makes it perfect for darning cotton, silk or linen fabrics e.g. cotton dress, linen trousers, silk vest or denim.