2 but you can use more if you want. Install them from each side of the zipper facing inward. Basically you have to pull the zipper apart alittle to get them started. So the zipper will need to be separated first and the pulls will reattach the coil as they are slid on. Dont forget to put your bottom stops on afterwards or at least stitch across the zipper to prohibit the zipper pulls from ever being accidentally unzipped too far.
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