Double sewing machine needles are the first choice when it comes to special effects with decorative and topstitching seams. Tucks or one- or two-tone seams can be easily implemented here. Especially with elastic and highly elastic materials such. B. T-shirt fabric or knitwear, the twin needle shows what it can do. The double sewing machine needles with flat shanks are specially designed for zigzag sewing machines, but also fit into all standard household sewing machines and are available with different needle gauges.