Lapel pins are primarily for aesthetic purposes, therefore, the part of the pin that attaches to the clothing is designed to stay hidden from view, which is referred to as lapel pin backs or a butterfly clutch. The lapel pin needle is threaded through the clothing and a back is placed on the needle to keep the lapel pin in place. The back is not visible when worn, making the lapel pin more pleasing to the eye. Metal Butterfly Clutch has been the standard lapel pin back for many years. It is lightweight, opens easily, and usually matches best to the actual pin. Metal butterfly clutch is also known as military clutch.