The COSTUMAKERS Activewear One Way Separating Zipper 30cm (12") - Rail - 1760 is designed for sports and activewear projects where a reliable, non-separating closure is required. It features #5 nylon coil; medium weight; one way separating; for jacket and vest use to balance durability with smooth operation. To install, stabilise the zipper area with interfacing or stay tape, baste to confirm alignment, and stitch close to the coil with a zipper foot. After sewing, test the slider’s travel end to end to ensure smooth functionality. Pair with matching thread for a seamless look or a contrasting tone for accentuated topstitching. Care is straightforward—follow garment fabric instructions and use a press cloth near the coil to protect the nylon. Keeping a variety of lengths and colours on hand streamlines new makes, alterations, and repairs.