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size 20 inner length 15cm size 21 inner length 15.5cm size 22 inner length 16cm size 23 inner length 16.5cm size 24 inner length 17cm size 25 inner length 17.5cm size 26 inner length 18cm size 27 inner length 18.5cm size 28 inner length 19cm size 29 inner length 19.5cm size 30 inner length 20cm size 31 inner length 20.5cm size 32 inner length 21cm 33? inner length cm size 34 inner length 22cm size 35 inner length 22.5cm