316L Surgical Stainless Steel Tapered Insertion Pins. The 2.4mm pin starts at 1.6mm and gradually increases in size to a 2.4mm. To use the pin, you will need to lubricate it (substances such as Savlon, Liquid Soap, Vitamin-E oil are recommended) and push it slowly through your piercing. Once the pin is almost all the way through the piercing you put the jewellery on the end of the pin, and push it though. The pin will then come out of the piercing and the jewellery will be in. It is recommended to wait at least 3 weeks in between each stretch.