27 inner length about 16.9cm

28 inner length about 17.5cm

29 inner length about 18.1cm

Approximately 18.7cm in length within 30cm

31 inner length about 19.3cm

32 inner length about 19.8cm

33 inner length about 20.5cm

34 inner length about 21.1cm

35 inner length about 21.7cm

36 inner length about 22.3cm

37 inner length about 23cm

38 inner length about 23.5cm