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5-30Pcs M3 M4 M5 M6 M8 M10 M12 Black Nylon Wing Nut Hand Tighten Thumbnut Butterfly Nut for Installation of Bolts and Screws 5-30Pcs M3 M4 M5 M6 M8 M10 M12 Black Nylon Wing Nut Hand Tighten Thumbnut Butterfly Nut for Installation of Bolts and Screws 5-30Pcs M3 M4 M5 M6 M8 M10 M12 Black Nylon Wing Nut Hand Tighten Thumbnut Butterfly Nut for Installation of Bolts and Screws