M4 x 50mm 12.9 Alloy Steel Hex Socket Head Cap Screws Bolt Black 20pcs Drive Type: Hex Socket; Head Style: Hex Head; Material: 12.9 Alloy Steel Package Content: 20 x Socket Head Cap Screw; Product Name: Socket Head Cap Screw; Thread Size: (DxL1)M4 x 22mm / 0.16" x 0.87"(D*L) Weight: 106g; Main Color: Black; Thread Pitch: 0.7mm Total Length: (L2) 54mm/ 2.1"; Head Size: (AxB) 7 x 4mm/0.28" x 0.16"(D*H) Width Across Flat (W): 3mm/ 0.12"; L Length: 50mm/ 2"