SIZE: 12ss=3.00-3.20mm/0.12 inches
SIZE: 16ss = 3.80-4.00 mm/0.15-0.16 inches
SIZE: 20ss=4.60-4.80mm/0.18-0.19in.
SIZE: 30ss = 6.32-6.50 mm / 0.26-0.26 inches
