SS304 316 Stainless Steel China Screws Fastener M3-M10 Black Plastic Thumb Screw M8 Tuercas Tornillos. Custom Size Support: Supports size customization based on customer product drawings. ISO9001 Certified Quality: Factory certified with ISO9001 and equipped with advanced machinery. OEM Design Capability: Accepts custom designs and manufacturing based on client requirements. Multiple Standard Grades: Available in grades 4.8, 6.8, 8.8, 10.9, and 12.9. Diverse Finish Options: Offers Plain, Black, Zinc Plate, and HDG finishes. Sample Availability: Samples provided based on stock; reasonable charges apply for molds. Wide Application Range: Suitable for Machinery, Chemical Industry, Environmental, and Building sectors. Flexible Payment Terms: Accepts L/C, T/T, D/P, and PayPal.