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: 15.80 mm (0.62 inches)
Size 6: 16.60 mm (0.65 inches)
Size 7: 17.40 mm (0.68 inches)
Size 8: 18.20 mm (0.71 inches)
Size 9: 19.10 mm (0.75 inches)
Size 10: 19.80 mm (0.78 inches)
Need more help with size? Check out the size guide.