YKK Slider #10 Vislon White Metal Double Locking Pull is specifically designed for use with YKK #10 Vislon Continuous Zipper Chain. This zipper slider features a low profile and a locking mechanism designed to grip the zipper chain to keep the slider from moving until the pull tab is tugged. These zipper sliders are specially designed to resist corrosion and UV rays. Double pull sliders allow the zipper to be opened from either side.