How big is a 18G piercing needle?

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How big is a 18G piercing needle?MEASUREMENTS: Gauge Size: 18G (1mm). Length: 45mm (1 3/4”). Type: Hollow Needle. PIERCING TYPES: Belly Button Ring, Eyebrow, Tongue, Tragus, Rook, Labret, Daith, Nipple, Prince Albert.