BodyJ4You Septum Clicker and Horseshoe Circular Barbell Stainless Steel 16G (1.2mm) 2PC 1 Round Paved Crystal Clear Crystal s 316L Surgical Steel Septum Clicker. 1- Steel Horseshoe Circular Barbell 16 Gauge Septum Size 16 Gauge (1.6mm) : Inside: W:9mm, H:7mm Horseshoe Size 16 Gauge (1.6mm) : Inside: W:10mm septum clicker has a hinge that easily opens and clicks closed.