Black YKK locking slider for #8 YKK nylon coil zipper. A locking zipper slider has a small pin lock mechanism in it that keeps the slider in place unless the slider's tab is pulled which releases the lock pin. The pin lock nestles between the teeth or coil on the zipper chain to prevent it from sliding. This prevents the slider from moving on its own if the tape is forced apart or if the slider is pushed. Locking sliders are normally used on applications where you do not want the slider to move unintentionally due to crosswise tension on zipper chain such as on trousers and jackets. These black #8 sliders are meant to be used with our #8 YKK nylon coil zipper.
The YKK Group has been producing reliable zipper sliders since 1934. YKK zippers are considered to be the best zippers due to being incredibly dependable. Roughly half of the zippers and zipper sliders in the world are made by YKK since garment and leather goods producers prefer their solid strong zippers and pulls.