20/50pcs M2 M2.5 M3 M4 M5 M6 M8 DIN7991 Black Grade 10.9 Steel Hex Hexagon Socket Head Flat Countersunk Head Allen Screw Bolt

20/50pcs M2 M2.5 M3 M4 M5 M6 M8 DIN7991 Black Grade 10.9 Steel Hex Hexagon Socket Head Flat Countersunk Head Allen Screw Bolt

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