uxcell M4x16mm Thread Button Head Hex Socket Cap Screw Bolt 100pcs Drive Type: Hex Socket; Head Style: Socket Button Head; Material: 10.9 Alloy Steel Package Content: 100(+/-2%)pcs x Button Head Screws; Product Name: Button Head Screws; Thread Size: (Male)M4x16mm/0.16"x0.63"(D*L) Weight: 164g; Main Color: Black; Thread Pitch: 0.7mm Total Length: 18mm/0.7"; Head Diameter: 7mm/0.28" Hex Socket Width: 2.5mm/0.1"; Head Height(Approx): 2mm/0.08"