uxcell M4x8mm Alloy Steel Hex Bolt Socket Head Cap Machine Screws 100pcs Drive Type: Hex Socket; Head Style: Socket Cap Head; Material: Alloy Steel Package Content: 100(+/-2%)pcs x Socket Head Cap Screws; Product Name: Socket Head Cap Screws; Thread Size: M4x8mm/0.16"x0.3"(D*L) Weight: 154g; Main Color: Black Thread Pitch: 0.7mm; Total Length: 12mm/0.47" Hex Socket Width: 3mm/0.12"; Head Size: 7x4mm/0.28"x0.16"(D*H)