US: 0G Plug / Tunnel (8mm) to United Kingdom Size 16G Piercing Standard

US: 0G Plug / Tunnel (8mm): Features a post thickness of 8 $\text{mm}$ (0.315 $\text{in}$), hoop inner diameter of 0 $\text{mm}$, gemstone carat equivalence of N/A (Plug), and earring style Plug / Stretched Lobe.

United Kingdom Size 16G Piercing Standard: Features a post thickness of 1.2 $\text{mm}$ (0.0472 $\text{in}$), hoop inner diameter of 0 $\text{mm}$, gemstone carat equivalence of 1.50 ct+ / Bold, and earring style Stud / Cartilage.