The general styles of zippers are as follows
1. Closed fasteners) The lower stop tooth fixing nail, the upper stop tooth is fixed by two stop teeth, pull the handle from bottom to top;
2. Open fasteners) The lower stopper is fixed by a pin type, and two stoppers are fixed on the upper stopper, and the slider is pulled from bottom to top for engagement.
3. Double-open zipper: There are two chucks in opposite directions. After pulling the chucks to both ends, close the chucks and fix the upper and lower teeth with two stoppers.
4.O type zipper: There are two chucks in opposite directions. Pull the chucks to the center and close the chucks. The upper and lower teeth are fixed with a stopper.
5. Invisible zipper: There is an invisible zipper on the back, which is a type of zipper in which the head is covered by the stretched cloth edge.