How Big Are Two 18 Gauges In One Ear Hole?

18ga is 1mm so ideally two of them would be 2mm. Which is 12ga. But in reality, things dont really work that way. Stretching your ears like that creates uneven holes. Its not the same size all around so a circular plug won't work out. Instead of creating a circular stretch, its more of a slit. So12ga jewelry probably won't fit in there.14ga might though. 14ga is 1.6mm.