This metal zipper pull is on a slider for a #5 nylon zipper (sold separately). It cannot be used with any other zipper.
Slide the pull onto the zipper from either end or slide 2 on to make a double pull opening.
Depending on your project is how many pulls you will need per meter of zipper. I personally would suggest 2-4 pulls/meter
Pulls are all sold separately so you can mix and match
1 - 1 pull
2 - 2 pulls
3 - 3 pulls