These bayonet pins are used to attach the spinnaker pole to the mast.The pin inserts into the Grand Prix and CR4 inboard ends.The pins are machined of high strength 17-4 PH stainless steel, and the toggles are investment cast of the same high strength material.
The toggles are available in 1/2" and 5/8". Custom hole sizes are available for the vertical pin. Commonly used for Harken cars and others, these pins are seen on yachts from 30 to 180 feet LOA.