Whilst we aim to provide standard US sizes, the exact measurements may differ slightly from design to design.
Please see below for the exact inner edge-to-edge diameter sizing:
Size 5: 15.70 mm (0.61 inches)
Size 6: 16.50 mm (0.65 inches)
Size 7: 17.50 mm (0.68 inches)
Size 8: 18.10 mm (0.71 inches)
Size 9: 18.90 mm (0.74 inches)
Size 10: 19.90 mm (0.78 inches)
Need more help with size? Check out the size guide.