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

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

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