KAMsnaps 5 Pairs (20 Pieces) Nursing Maternity Clips Clasps Plastic Hooks Front Closure Buckle for DIY Breastfeeding Pumping Bras Camis and Tank Tops (Black 12mm or 1/2 Inch) Used on convert existing or new bras or tank tops into nursing or maternity bras and tank tops. 5 pairs = 20 pieces total, enough to convert 5 bras, camis or tank tops. Makes a distinct snapping sound when the clip is properly secured closed. Clasps have a 12mm (about 1/2") opening for your strap.