How Do Zippers Work?
A zipper track has a row of teeth on each side. These teeth all have a hook and hollow. The slide moves up and down the zipper track. The slide pushes the teeth together to close the zipper track. A high-quality zipper provides a very strong bond that is difficult to break without moving the slide in the opposite direction to separate the teeth. Zippers require all of the teeth to be exactly the same size for the mechanism to work correctly.