17cm inside size 26

17.5cm inside size 27

18.2cm inside size 28

18.8cm inside size 29

19.5cm inside size 30

20cm inside size 31

20.5cm inside size 32

21cm inside size 33

21.5cm inside size 34

22cm inside size 35

22.5cm inside size 36

23cm inside size 37

23.5cm inside size 38