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Grey/Black Phosphorus Drywall Screw Making Machine/Screw Drywall. Customizable Colors: Customized colors are optional with professional R&D support. Flexible Packaging: Options include color box, wooden box, small carton, or woven bags. Wide Size Range: Diameters M3.5-M4.8 and lengths 13mm-254mm available. Multiple Surface Treatments: Black phosphate, grey phosphate, and zinc-plated options. Sample Refund Policy: Sample cost is refundable upon order confirmation exceeding MOQ. Fast Quotation: Quotes provided within 24 hours of inquiry receipt. OEM/ODM Service: Full service from design to production in our factory. Reliable Supply Chain: Stable and traceable raw material supply lines.