Nautix Screw and Nut for US box fins
A replacement Screw and Nut for most US box fins that have flat upper surface and require a 4mm screw.
Brass M4 Nut.
Slot head slightly domed Stainless Steel Screw with a Head O.D. of 7.9mm and depth of 2.3mm - M4 thread, length 20mm.
Nautix Fin Screw and Nut for US box fin - M4 20mm screw
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