plastic adjuster/ring and slider ,Shape of ring, slide and hook has huge variety, depend on the shape of mould from different manufacturers and on customers'requests. The most common shape for ring is circle which looks like an "O". Triangle, rectangle, square, heart, star shape, rectangle with saw tooth shape or even flower shape can be found for the different purposes on intimate garment.

Most commonly seen slide and hook are in rectangular shapes which look like "8" and "9" respectively. The shape of slide usually varies in the size of two holes, which allows different sliding way. Different opening combinations are found for hook, e.g. "S" shape which has hook on each side, narrower hole and wide hook, double-crossbar for the hole and hook.
Common size range for rings, slides and hooks is from 6mm to 30mm,now we have size4mm,38mm

big function in lingerie,also on detachable shoulder strap or suspender belt,  swimwear back closure and front-closure