Bluemoona 20 Sets - 20mm 13/16" Hidden Invisible Sew-In Magnetic Snap PVC Closure Purse Fastener Snap diameter: 20mm or 13/16" Square pvc size:35mm or 1.38" snap is covered with a PVC for sewing your snap into your application Magnetic button for easy opening and closing Easy to sew over with machine, making it completely invisible on the outside of the bag Use on bags, totes, backpacks, jacket pockets, purses and lanyards.