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316 SS T30 drive button head screws with flange for greater load distribution on your washers and foil box to take the load of your foil mast that uses M6 hardware. Most brands and almost all racing windsurf hydrofoils use M6 screws to attach the mast to the board. Most track mount style foils use M8 hardware, which we also carry here. Slingshot foils with tuttle adapters use M8 and M10 hardware (Phantasm/Hoverglide series respectively). The Hoverglide series can be adapted to use M6 hardware if required.