Snap Fasteners are defined as any clasp or fastener that closes with a click. This type of closure is perfect for everything from home decor to kids clothing. Use in place of buttons as they are easier to close. Dritz Snap Fastener Sew On Assorted Sizes Nickel 36pc- Sizes 1, 2, and 4. 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.