Surface:
nickel-plated / blue zinc-plated / black zinc-plated
Thread diameter:
3mm(M3) / 4mm(M4) / 5mm(M5) / 6mm(M6) / 8mm(M8) / 10mm(M10)
Thread pitch:
0.5mm(M3) / 0.7mm(M4) / 0.8mm(M5) / 1.0mm(M6)/1.25mm(M8) / 1.5mm(M10)
Material:
carbon steel