The COSTUMAKERS Outerwear One-Way Separating Zipper 50 cm (20 in) in Black (1747) is built around robust #5 antique-brass metal teeth that balance strength with a refined fashion look. It features a one-way separating bottom so the wearer can fully open the garment hem—perfect for coats, casual jackets, and fashion outerwear. The slider uses a drop pull for easy handling and a confident feel, while the precision-formed elements mesh cleanly to resist snagging when passing thick seams and facing layers. A durable woven tape supports the chain, lying flat for professional installation and top-stitching. This medium-weight gauge is a shop favourite for everyday outerwear because it tolerates repeated cycles without tooth deformation and keeps a smooth run after laundering. Suitable for new construction or replacement work in apparel, costumes, and craft projects where antique-brass styling is desired. Coordinates with 1746.