uxcell M3x20mm 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)M3x20mm/0.12"x0.8"(D*L) Weight: 96g; Main Color: Black; Thread Pitch: 0.5mm Total Length: 21mm/0.83"; Head Diameter: 5.5mm/0.22" Hex Socket Width: 2mm/0.08"; Head Height(Approx): 1mm/0.04"