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Black Drywall Screws for Attaching Drywall to Wood. Self-Drilling & Tapping: Features self-drilling and self-tapping tails for efficient installation into wood. Anti-Corrosion Surface: Black/Grey phosphated or zinc coating surface provides good anti-corrosion ability. Customizable Dimensions: Length ranges from 11-150mm with fine or coarse thread options available. OEM/ODM Support: Customized design is available; OEM and ODM services are welcomed. Fast Delivery: 5-10 days for stock items; 2-4 weeks for non-stock items based on quantity. Manufacturer Direct: Direct factory with over 20 years experience and 100% product inspection.