... standard as request&design.2. Material:Carbon steel, Alloy steel, stainless steel or according require.3. Grade of Roofing bolt:Metric ... , A2-70, A4-70, A4-804. Dimension : M5-M20 or as request5. OEM&Customize non-standard products welcome.6. Surface ... examples: MaterialStailess steel SS301, SS304 SS316 SS430,carbon steel,alloy or as request Finishnickel plated, passivation,black oxide,self color SizeM5 ...