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size 21 inner length is about 13.5cm size 22 inner length about 14cm size 23 inner length is about 14.5cm size 24 inner length about 15cm size 25 inner length is about 15.5cm size 26 inner length about 16cm size 27 inner length is about 16.5cm size 28 inner length about 17cm size 29 inner length about 17.5cm size 30 inner length about 18cm size 31 inner length about 18.5cm size 32 inner length about 19cm size 33 inner length is about 19.5cm size 34 inner length about 20cm size 35 inner length is about 20.5cm size 36 inner length about 21cm the inner length of size 37 is about 21.5cm size 38 inner length about 22cm