1.5      0.20mm

2         0.23mm

2.5      0.26mm

3         0.28mm

3.5      0.30mm

4         0.33mm

5         0.37mm

6         0.40mm

8         0.47mm

10       0.52mm

12       0.57mm

16       0.65mm

18       0.70mm

20       0.74mm

24       0.82mm

26       0.85mm

30       0.92mm