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M6 and 1/4" Washer for fin screws

These stainless washers have a 6.6 mm ID so they work with both M6 screws and 1/4" screws. The thickness is 1.5mm average and the OD is 18mm to help spread the load of your screws. Long story short, these washers work with almost any windsurfing setup to interface your fin screws with the box.