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Gypsum Board Screw Manufacture Black Drywall Screw. High Strength Grade 12.9: Made from Carbon Steel C1022A with Grade 12.9 strength for durability. Multiple Surface Treatments: Available in Black/Gray Phosphated and Yellow Zinc Plated finishes. Wide Size Range: Lengths from 13mm to 254mm and diameters from 3.5mm to 4.8mm. ODM & OEM Support: Customized design is available, welcoming ODM and OEM orders. Fast Response Time: Staff reply within 24 working hours to answer all questions. Free Sample Offer: Free samples provided, customer only pays for freight cost. Flexible Delivery: 5-10 days in stock, 15-20 days if not in stock based on quantity. Standard Compliance: Meets DIN, GB, ANSI, BSW, JIS, and GOST standards.