10 Pairs (40 Pieces) KAMsnaps Nursing Maternity Clips Clasps Fasteners Plastic Hooks Front Closure Buckles for DIY Mom Breastfeeding Pumping Bras Tank Tops 12mm (Black 1/2 Inch) Used on convert existing or new bras or tank tops into nursing or maternity bras and tank tops. 10 pairs = 40 pieces total, enough to convert 10 bras, camis or tank tops. Makes a clicking sound when the clip is properly secured closed. Clasps have a 12mm (about 1/2") opening for your strap.