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Phillips Wafer Truss Head Zinc Coating Self-Tapping/Self-Drilling Screw. Customized Dimensions: Diameter ST 4.2 (8#) and Length 13mm to 76mm available. Multiple Surface Options: Plain, Zinc Plated, and Black Phosphated treatments available. 100% Quality Inspection: Every screw undergoes 100% inspection before shipment. Customized Service: Production available based on customer drawings and requirements. Free Sample Availability: Free samples provided for quality check and market testing. Fast Quotation Response: Quotations provided within 24 hours of receiving inquiry. Standard Compliance: Meets DIN, GB, and ANSI standards for reliability. Versatile Application: Ideal for metal frame connectors and fixing tasks.