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5~100pcs M3 M4 M5 M6 M8 M10 M12 Black Carbon Steel Serrated Spinlock Hex Flange Nut Nickel-plated Color Zinc Lock Nuts 5~100pcs M3 M4 M5 M6 M8 M10 M12 Black Carbon Steel Serrated Spinlock Hex Flange Nut Nickel-plated Color Zinc Lock Nuts 5~100pcs M3 M4 M5 M6 M8 M10 M12 Black Carbon Steel Serrated Spinlock Hex Flange Nut Nickel-plated Color Zinc Lock Nuts