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NINDEJIN hex hexagon socket head cap screw nut 12.9 grade carbon steel m2 m2.5 m3 m4 m5 m6 screw set bolt and nut assortment kit NINDEJIN hex hexagon socket head cap screw nut 12.9 grade carbon steel m2 m2.5 m3 m4 m5 m6 screw set bolt and nut assortment kit NINDEJIN hex hexagon socket head cap screw nut 12.9 grade carbon steel m2 m2.5 m3 m4 m5 m6 screw set bolt and nut assortment kit