This section was created to hold the various hardware needed to sew bras, lingerie, belts, bikini tops, swim suit tops, etc. You will find several types of bra clasps and fasteners as well as strap slides and strap rings of several sizes. For bra/swimsuit straps that are adjustable in length, you will need 1 slider and 1 ring for each strap. Try to match the width of the strap as close as you can to the width of the slider or ring.
All of these "hard" items for sewing bras, lingerie, swimsuits, bikinis, etc. are known as hardware.