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Electro polished stainless steel. As a guide for usage 6mm. (1/4") pins are suitable for boats up to 3m (10'), 8mm pins (5/16) for up to 3.5m (12') dinghies and 9.5mm 3/8 up to 6.6m (22') dayboats. Also to be taken into consideration are many other factors such as the boat�s displacement, rudder size and transom, depth etc. Retaining clips spring rests on rudder or transom gudgeon to prevent release of rudderhead. Sold by the each.