uxcell M4 x 8mm Alloy Steel Hex Bolt Socket Head Cap Screws Black 100 Pcs Drive Type: Hex Socket; Head Style: Button Head; Material: Alloy Steel Package Content: 100(+/-2%) x Socket Button Head Screws; Product Name: Socket Button Head Screws; Thread Size: 4(M4) x 8mm/ 0.16" x 0.31"(D*L) Weight: 104g; Main Color: Black Thread Pitch: 0.7mm; Total Length: 10mm/ 0.4" Head Diameter: 7mm/ 0.28"; Hex Key Size: 2mm/ 0.08"