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10/50pcs M2 M2.5 M3 M3.5 M4 M5 M6 M8 DIN916 Black grade 12.9 alloy steel Hex Hexagon Socket Allen Cup Point Grub Screw Set Bolt 10/50pcs M2 M2.5 M3 M3.5 M4 M5 M6 M8 DIN916 Black grade 12.9 alloy steel Hex Hexagon Socket Allen Cup Point Grub Screw Set Bolt 10/50pcs M2 M2.5 M3 M3.5 M4 M5 M6 M8 DIN916 Black grade 12.9 alloy steel Hex Hexagon Socket Allen Cup Point Grub Screw Set Bolt