Stretching Tapered Insertion Pins are used to stretch piercings up one size at a time. At one end of the tapered insertion pin is a small groove slightly larger than the size of the intended jewellery. The new jewellery slots into the larger end and is threaded through the stretched piercing.
Pushing the pin slowly through the piercing will stretch it up to the desired size. When the tapered insertion pin is all the way through, the jewellery will follow and slide into the piercing.