Sizing:

Size 3 = 4 3/4 in.

Size 4 =  5 in

Size 5 = 5 1/4 in.

Size 6 = 5 1/2 in. 

Size 7 = 5 3/4 in.

Size 8 = 6 in.

Size 9 = 6 1/4 in.

Size 10 = 6 1/2 in