5 Pairs (20 Pieces) KAMsnaps Nursing Maternity Clips Clasps Plastic Hooks for DIY Bras Camis and Tank Tops Black 20mm x 13mm (3/4" x 1/2") Used to 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 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.