... & ISO9001. 4. OEM is available. Specification: Product nameScrew, Different function of Screws BrandWDMaterialCarbon Steel (35#, 45#), Alloy steel (35crmo, 40cr)SizeM3 ... DIN Surface treatmentBlack oxide, Zinc plated, hot galvanized, plated dacromet and bonderizing.ColorBlack, zinc, yellow, silveryRemark:1. Products can be ... .2. Non-standard product is available. Screw, Different function of Screws