Expand the design possibilities of buttons with the 21mm silver-plated brass round pin back. This pin back works with buttons to transform them into pins that can be worn as cute accessories. This pin back works especially well with Czech glass buttons with wider button loops. Simply glue this pin back to the back of the button to transform it into a pin. The pin back features a wide hole in the center to accommodate for the button loop, making sure it won't get in the way of turning your buttons into pins. This pin back displays a lustrous silver gleam that will work with any color palette.