Create a bang with this gun industrial barbell. This 30mm barbell works for multiple piercings. For the helix piercing simply insert each end of the barbell into each hole to wear... Specifications: 14 Gauge (1.6mm), 1 3/16" (30mm), 316L Surgical Grade Stainless Steel Barbell, 5mm Balls, Item Sold Individually. Surgical Steel Gun Industrial Barbell Earring