Name:External Hexagonal Screws Bolt Wing NutTwo-piece set: Bolt + NutMaterial: Black Nylon(Plastic)Metric thread diameter:M3 (3mm) / M4 (4mm) /M5 (5mm) / M6 (6mm) / M8(8mm) / M10(10mm) / M12(12mm)Metric thread pitch:0.5mm(M3) / 0.7mm(M4) /0.8mm(M5) / 1mm(M6) / 1.25mm(M8) / 1.5mm(M10) / 1.75mm(M12)Thread length: 6mm-100mm (Excluding head length)For example: M3x6mm-10pcs (thread diameter 3mm,length 6mm,quantity 10.)