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Easymech Set Of M5 X 8MM Socket Head Cap (Allen) Bolt And Nut-4 PcsBrand: EasyMechType: M5 (5.0 mm Bolt Diameter)Bolt Head Outer Diameter: 8.5 mmBolt Length: 8 mmBolt Head Style: RoundBolt Drive Style: Hex SocketColor: BlackNut Type: HexNut Outer Diameter: 8 mmAllen Key size Required: 4 mm.Hardness is 2 times higher than copper,10 times higher than aluminum.