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Strength Hardened China Screw Flange Head Self Drillinging Screw. Customized Surface Finish: Options include Zinc Plated, Ruspert, Dacromet, and Hot dip galvanizing. Wide Material Selection: Available in Carbon Steel C1022 and Stainless Steel 304/316/410. Standard Compliance: Meets DIN and IFI standards or custom drawings. Flexible Packaging: Bulk packing, small boxes, or pallets available. OEM/ODM Service: Full customization from samples and designs available. Fast Delivery for Stock: In-stock goods delivered within 2-5 days. Certified Quality: ISO certified with random visual and function inspection. Free Samples for Regular Items: Free samples offered for regular screws (courier excluded).