Sew-On Snaps Nickel Size#1/0 10Ct Dritz Snap Fasteners are defined as any clasp or fastener that closes with a click. Are wonderful to use and so easy to apply. This type closure is perfect for everything from home deco to kids clothing. Use in place of buttons, they're easier to close. These sew-on snaps are quick and easy to attach. They each have "guide holes" in the center of the stud (ball) and socket to allow for perfect alignment.