United Kingdom Size 20mm Medium Hoop to US: 6mm Tiny Helix Hoop

United Kingdom Size 20mm Medium Hoop: Features a post thickness of 1.2 $\text{mm}$ (0.0472 $\text{in}$), hoop inner diameter of 20 $\text{mm}$, drop length of 20 $\text{mm}$, gemstone carat equivalence of N/A, and earring style Hoop / Everyday Medium.

US: 6mm Tiny Helix Hoop: Features a post thickness of 0.8 $\text{mm}$ (0.0315 $\text{in}$), hoop inner diameter of 6 $\text{mm}$, drop length of 6 $\text{mm}$, gemstone carat equivalence of N/A, and earring style Cartilage Hoop / Snug Helix.