1.6 mm internal jewellery (inner thread 1.2 mm)
- for 1.2mm outer diameter the inner thread will have 0.8mm
- for 1.6mm outer diameter the inner thread will have 1.2mm
- for 1.2mm outer diameter the inner thread will have 0.8mm
- for 1.2mm outer diameter the inner thread will have 0.8mm
- for 1.6mm outer diameter the inner thread will have 1.2mm