10 Pairs (40 Pieces) KAMsnaps Nursing Maternity Clips Clasps Plastic Hooks Buckles for DIY Breastfeeding Bras Camis and Tank Tops Black (3/4" x 1/2") Used to 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. Bottom clasp has a 20mm (3/4") opening for your strap. Top clasp has a 13mm (1/2") opening for your strap.