... of hex bolt and nut:Metric standard: Grade 4.8, Grade6.8, Grade8.8, Grade10.9,Grade12.9.Inch standard: Grade2, Grade5, Grade8, B7.stainless steel , A2 ... -70, A4-70, A4-804. Dimension :Metric size from 4mm-100mm, Inch size from 1/8"-45. OEM&Customize non-standard products ...