US: 00G Plug / Tunnel (10mm) to United Kingdom Size 10mm Standard Hoop

US: 00G Plug / Tunnel (10mm): Features a post thickness of 10 $\text{mm}$ (0.3937 $\text{in}$), hoop inner diameter of 0 $\text{mm}$, gemstone carat equivalence of N/A (Plug), and earring style Plug / Stretched Lobe.

United Kingdom Size 10mm Standard Hoop: Features a post thickness of 1 $\text{mm}$ (0.0394 $\text{in}$), hoop inner diameter of 10 $\text{mm}$, gemstone carat equivalence of N/A (Hoop), and earring style Hoop / Classic Fit.