Multistrand sterling wire is 3 strands of round 22 gauge AWG, which is 0.64mm, twisted together. 22g multistrand wire measures 1.36mm and is closest in size to 16g round, which is 1.29mm. Inside diameter is mandrel size, not actual ring...

Multistrand sterling wire is 3 strands of round 20 gauge AWG, which is 0.81mm, twisted together. 20g multistrand wire measures 1.74mm and is closest in size to 14g round, which is 1.63mm. Inside diameter is mandrel size, not actual ring...

Multistrand sterling wire is 3 strands of round 18 gauge AWG, which is 1.02mm, twisted together. 18g multistrand wire measures 2.24mm and is closest in size to 12g round, which is 2.05mm. Inside diameter is mandrel size, not actual ring...

Multistrand sterling wire is 3 strands of round 16 gauge AWG, which is 1.29mm, twisted together. 16g multistrand wire measures 2.82mm and is closest in size to 10g round, which is 2.54mm. Inside diameter is mandrel size, not actual ring...