US: 2G Plug / Tunnel (6mm) to United Kingdom Size 20G Standard Stud

US: 2G Plug / Tunnel (6mm): Features a post thickness of 6 $\text{mm}$ (0.2362 $\text{in}$), hoop inner diameter of 0 $\text{mm}$, gemstone carat equivalence of N/A (Plug), and earring style Plug / Stretched Lobe.

United Kingdom Size 20G Standard Stud: Features a post thickness of 0.8 $\text{mm}$ (0.0315 $\text{in}$), hoop inner diameter of 0 $\text{mm}$, gemstone carat equivalence of 0.25 ct - 0.50 ct, and earring style Stud / Minimalist.