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Size Guide Shires Bit

Inches 3" 3.5" 4" 4.25" 4.5" 4.75" 5" 5.25" 5.5" 5.75" 6"
Centimetres 7.5cm 9cm 10cm 10.5cm 11.5cm 12.cm 12.5cm 13cm 14cm 14.5cm 15cm

 

The Shires bit mouthpieces are measured are measured from the inner ring hole edges.