Internally threaded circular barbell, 6 ga Home » Circular Barbells | Ear Piercing | Internally Threaded Jewelry | Male Piercing | Stainless Steel Shown: 13mm circular barbell.Material: 316L surgical stainless steel, implant gradeGauge: 6Type: circular barbellDiameter: optionalBall size: 5/16" (8mm) Your Price: $ Diameter: ----- Choose One -----1/2" (13mm)5/8" (16mm)3/4" (19mm)Quantity: