Features： 1、FULL THREAD: Countersunk head carbon steel self drilling screws with full thread for retention, more stable 2、RUST RESISTANT HOUSING: Zinc plated process provides an corrosion resistant housing for long lasting fasteners 3、WIDE USES: Can be used for wood, metal and other tough materials. Use self drilling screws to secure materials to aluminum or metal sheets 4、NO BURRS OR GAPS: The screw section is smooth without burrs, and the threads are clear and neat without gaps, which is conducive to tightening 5、VERSATILE 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 crafts Specification： Item Type: Self Drilling Screw Material: Zinc plated carbon steel Surface Treatment: Galvanized Product Specification: M4.2x38mm Package List： 250 x Self Drilling Screw