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What is the internal diameter of 18ct Bayonet Clasps?

External & Internal diameter of 18ct Bayonet clasps 18ct Yellow Bayonet Clasp 1.8mm Outside Diameter, 0.86mm Internal Diameter 18ct Yellow Bayonet Clasp 2.7mm Outside Diameter, 1.7mm Internal Diameter Cookson Product code: NNPG 218 - 18ct Yellow 1.8mm O/D NNPG 227 - 18ct Yellow 2.7mm O/D