uxcell&reg; M4 x 16mm 12.9 Alloy Steel Hex Socket Head Cap Screws Bolt Black 30pcs Drive Type: Hex Socket; Head Style: Hex Head; Material: 12.9 Alloy Steel Package Content: 30 x Socket Head Cap Screw; Product Name: Socket Head Cap Screw; Thread Size: (dxL)M4 x 16mm/ 0.16" x 0.6"(D*L) Weight: 66g; Main Color: Black Thread Pitch: 0.7mm; Total Length: (L1) 20mm/ 0.8" Head Size: (Dxk) 7 x 4mm/0.28" x 0.16"(D*H); Width Across Flat (s): 3mm/0.12"