21-inner 13cm, 22-inner 13.5cm, 23-inner 14cm, 24-inner 14.cm, 25-inner 15cm, 26-inner 16cm, 27-inner 16.5cm, 28-inner 17cm, 29-inner 17.5cm, 30-inner 18cm, 31-inner 19.4cm, 32-inner 20cm, 33-inner20.5cm, 34-inner 21.1cm, 35-inner 21.8cm, 36-inner 22.6cm