... plated,Black Oxide,HDG Roofing bolt 1. Standard:DIN, ANSI, BSW, JSB ans ISO standard or non-standard as request&design.2. Material:Carbon ... steel or according require.3. Grade of Roofing bolt:Metric standard: Grade 4.8, Grade6.8, Grade8.8, Grade10.9,Grade12 ... -804. Dimension : M5-M20 or as request5. OEM&Customize non-standard products welcome.6. Surface treatment:Plain, black finished, Zinc plated ...