Costumakers Reversible Zipper Slider in Black converts a standard #5 zipper so it can be opened from either side—ideal for sleeping bags, reversible jackets and tents. Engineered for medium‑weight zippers with metal or molded plastic teeth, it installs easily and glides smoothly for dependable operation. Pair it with Costumakers #1750 or #1754 zippers when replacing a worn slider. A handy fix to extend the life of outdoor gear and everyday garments.