ByAnnie's Tool-free Snaps are easy to install and don't require any specialized equipment. Install by hand, literally in a snap! Use Tool-free Snaps to close pockets, flaps, garments, and more. They keep items secure and provide easy access snap after snap. Each packages comes with FOUR (4) full sets of snaps. This means you get: 4x Fashion metal caps (recommended for the visible/exterior part of project) 4x Plastic studs (for forming connection to socket) 4x Plastic sockets (for forming connection with stud) 4x Low-profile plastic caps (recommended for the non-visible/interior part of project) See ByAnnie's video (coming soon) for full installation instructions. The fashion metal caps of ByAnnie's Tool-free snaps are available in three metal finishes (Antique Brass, Black Metal and Nickel). Match it with ByAnnie's other metal hardware for a coordinated look. Underneath the metal finish, the Tool-free snaps components (socket, stud, and low-profile cap) are made of plastic, keeping weight and thickness to a minimum. Metal cap measures 14mm in diameter. Plastic cap measures 13mm. Note: Material thickness limitations may apply.