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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 is about 16.2cm size 27 inner length is about 16.7cm size 28 inner length about 17.3cm size 29 inner length about 17.8cm size 30 inner length about 18.5cm size 31 inner length about 18.8cm size 32 inner length is about 19.4cm size 33 inner length about 20cm size 34 inner length is about 20.7cm size 35 inner length about 21.3cm the inner length of size 36 is about 21.8cm size 37 inner length is about 22.4cm