bolt and nut 2)finish :Zinc plated / Yellow zinc plated / Plain 3)Usage : ... .2. Material:Carbon steel,3. Grade of hex bolt and nut:Metric standard: Grade 4.8, Grade6.8, Grade8.8, Grade10 ... , Grade8, B7.stainless steel , A2-70, A4-70, A4-804. Dimension :Metric size from 4mm-100mm, Inch size from 1/8 ... B/L copy GALVANIZED MILD STEEL ROOFING hex bolt and nut