SIZE: 12ss=3.00-3.20mm/0.12 in.
SIZE:16ss=3.80-4.00mm/0.15-0.16in.
SIZE: 20ss=4.60-4.80mm/0.18-0.19in.
SIZE:30ss=6.32-6.50mm/0.25-0.26in.
SIZE: 34ss=7.07-7.27mm/0.28-0.29 in.
