26 in length about 16cm

27 in length about 16.6cm

28 in length about 17.3cm

29 in length about 18cm

About 18.7cmcm long within 30cm

31 inner length about 19.3cm

32 inner length about 19.7cm

33 inner length about 20.3cm

34 inner length about 21cm

35 inner length about 21.7cm

36 in length about 22.4cm

The size is too small. it is recommended to order according to the inner length + 1cm