SIZE: 7ss=2.10-2.20mm/0.08 inches
SIZE:12ss=3.00-3.20mm/0.12 inches
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.
