handmade items Size Guide Size 5 1/4 Circumstance 50 mm Diameter 15.9 mm United states 5 1/4 Size 6 1/2 Circumstance 53 mm Diameter 16.9mm United states 6 1/2 Size 7 1/4 Circumstance 55 mm Diameter 17.5 mm United states 7 1/4 Size 8 1/2 Circumstance 58mm Diameter 18.5 mm United states 8 1/2