23 (inner length 15cm)

24 (inner length 15.5 cm)

25 (inner length 16 cm)

26 (inner length 16.5 cm)

27 (inside length 17 cm)

28 (inner length 17.8 cm)

29 (inner length 18.3 cm)

30 (inner length 18.8 cm)

31 (inner length 19.5cm)

32 (inner length 20 cm)

33 (inner length 20.5 cm)

34 (inner length 21.5 cm)

35 (inner length 22 cm)

36 (inner length 22.5cm)