●HIGH QUALITY: These binders are made of high quality metal , very durable. ●GREAT PERFORMANCE: The folds the tape in half around the fabric and the guide design will keep tape straight. ●4 SIZES: There are 4 sizes of which you can choose the size you need before buying. ●WIDELY APPLICATION: Widely used on most 2-needle or 3-needle industrial sewing machines, flat seamers. Does not fit Consew 205 RB machine. ●IMPROVE EFFICIENCY: This is used to insert bias binding or tape along the edge of the garment, perfect for sewing machine. The attachment folds the fabric to create a clean finish on top and a raw edge on bottom.