Open-End Zipper: Open-End Zipper (开尾拉链)
A zipper that can be fully separated at the lower end because it uses an insertion pin and box instead of a fixed bottom stop. This design allows jackets, coats and sportswear to be opened completely, which is convenient for dressing. Separation and re-insertion must stay smooth after many cycles, so pin and box fit is carefully controlled. Open-end zippers are tested for insertion force, retention and cycle life.