SIZE: 8ss=2.30-2.40mm/0.09 inches
SIZE: 9ss=2.50-2.60mm/0.10 inches
SIZE: 10ss=2.80-2.90mm/0.11 inches
SIZE: 16ss=3.80-4.00 mm/0.15-0.16 inches
SIZE: 20ss = 4.60-4.80 mm/0.18-0.19 inches