Item Type: Self Drilling Screw_x000D_ Material: Zinc plated carbon steel_x000D_ Surface Treatment: Galvanized_x000D_ Product Specification: M4.2x38mm 1FULL THREAD: Countersunk head carbon steel self drilling screws with full thread for excellent retention, more stable 2RUST RESISTANT HOUSING: Zinc plated process provides an excellent corrosion resistant housing for long lasting fasteners 3WIDE USES: Can be used for wood, metal and other tough materials. Use self drilling screws to secure materials to aluminum or metal sheets 4NO BURRS OR GAPS: The screw section is smooth without burrs, and the threads are clear and neat without gaps, which is conducive to tightening 5VERSATILE AND PRACTICAL: Self drilling screws are widely used in household and office appliances, fasteners in the workplace, electrical products, communication equipment, ship assembly, machinery, furniture, repair work, DIY crafts250 x Self Drilling ScrewPay attention to the correct operation.