A great notion to insert elastic into waistbands of pants and skirts.
It can also be used for drawing cords through casings.
Slide the ring up toward top of the bodkin, insert elastic or cording between the tweezers teeth.
Slide the ring toward the teeth to tighten bodkin.
I have found the 3" long bodkin to be an easier way to insert elastic and cording than using a safety pin.