How big is 1.6cm in ring size?

A ring size of 1.6 cm corresponds to a size 5 in US ring sizing, which is approximately 15.7 mm in diameter. This size typically fits a finger circumference of around 5.5 inches (14 cm). Keep in mind that ring sizes can vary slightly between different countries and manufacturers. Always measure your finger or consult a sizing chart for the most accurate fit.