uxcell M8 x 12mm Alloy Steel Hex Bolt Socket Head Cap Screws Black 20 Pcs Drive Type: Hex Socket; Head Style: Button Head; Material: Alloy Steel Package Content: 20 x Socket Button Head Screws; Product Name: Socket Button Head Screws; Thread Size: 8(M8) x 12mm/ 0.31" x 0.5"(D*L) Weight: 139g; Main Color: Black; Thread Pitch: 1.25mm Total Length: 16mm/ 0.6"; Tensile Strength: 10.9 Head Diameter: 14mm/ 0.55"; Hex Key Size: 5mm/ 0.2"