High quality 316L surgical stainless steel coil closure ring. The coil section is held in place by way of a tension grip. To remove the coil, pull the two ends of the ring apart and the coil will drop out. To replace the coil, pull the two ends of the ring apart, position the two holes on either side of the coil onto the ring ends and then release your hold on the ring. The two ends of the ring will squeeze together to hold the coil in place. This steel coil closure ring has a gauge of 1.6mm and is offered in a choice of 10mm and 12mm internal diameter.