0.8 mm
For 0.8mm thread - 1.2mm Barbell / Labret / DA
For 0.8mm thread - 1.2mm Barbell / Labret / DA
For 0.8mm thread - 1.2mm Barbell / Labret / DA
The attachment has a thread: 0.8mm. As an attachment, it fits accordingly for Internal jewelry (Barbell / Labret / DA) with an internal thread of 0.8mm or 1.2mm.