Chevron down icon Chevron down icon 16g, Hinged Ring, Titanium, Double Stacked by Adamant Body Jewelry Sale Login to see prices | Login to see prices / Titanium Hinged Ring Material Implant Grade Ti-6Al-4V Gauge 16g (1,2mm) Double Stacked. Diameter: 5/16" (8mm) and 3/8" (10mm) Hand Polished Titanium.