This new style of (re)moveable styling tack has a stud element that is integrated into the button.
To use the buttons, simply remove the leather backing, slip the button shaft in between the stitches of the knitwear / crochetwear and then pop the leather backing on the shaft on the wrong side of your material.
It's crisp, quick, and easy. These stud buttons are not just quick finishing. They are instantaneous finishing.