Durable metal construction that resists rust for long lasting use. Zipper cylinder design keeps folds clean and precise, making hemming easier and providing a secure grip on the fabric for better control. Broad compatibility with most household sewing machines that have a low shank, and it is suitable for some thin fabrics, offering a practical and reliable result. This zipper cylinder is the perfect tool for low shank sewing machines. Use scenarios - Hem lightweight fabrics such as sheer curtains, summer blouses, or thin cotton where a neat fold and firm fabric control are important. - Work with delicate or thin fabrics like silk or chiffon to improve fabric handling and reduce slipping during sewing. - General home sewing tasks on low shank machines, especially projects involving hems and fabric grip where precision matters.