Internally threaded circular barbell, 6 ga Home » Circular Barbells | Ear Piercing | Internally Threaded Jewelry | Male Piercing | Stainless Steel Gauge (Thickness): 6 (4.0mm)Ball size: 5/16" (8mm)Material: 316L surgical grade stainless steel Type: circular barbellThreading Type: Internally ThreadedShown: 13mm circular barbell. Retail Price: $9.76Your Price: $ Diameter: 5/8" (16mm)only this diameter is availableQuantity: