16 gauge Black Spiral Barbell can be used as a Cartilage Earring, Tragus Earring, Lip Hoop, Eyebrow Ring, Helix Earring, 16 gauge Nipple Ring, 16 gauge Belly Ring or 16 gauge earring.The spiral barbell has two 1/8 inch (3mm) end balls, externally threaded. These are sold individually, not in pairs. Photo is enlarged to show detail. The 316L Surgical Stainless Steel Spiral barbell is 16 gauge and available 5/16 inch (8mm), 3/8 inch (10mm) inner diameter. Inner diameter is measured in a straight line across inside of barbellThis item is suitable for spiral cartilage earrings, black body jewelry, tragus earrings, black eyebrow rings, lip hoops, 16 gauge belly button rings, ear cartilage piercings, helix piercings, ear lobe piercing, conch piercings, 16 gauge nipple piercings , tragus piercings, lip piercings, or almost any 18 gauge or 16 gauge piercing. Also known as twister barbell.