250pcs Countersunk Self Drilling Screw Galvanized Carbon Steel Fastener M4.2x38 Feature:1. Full Thread: Carbon Steel Countersunk Screws with full thread for excellent retention, more stable2. Rust-resistant housing: Galvanized process provides excellent corrosion-resistant housing for long-lasting fasteners3. Wide applications: can be used for wood, metal and other hard materials. Use self-drilling screws to secure the materials to aluminum or sheet metal4. No burrs or gaps: the screw section is smooth without burrs, and the threads are clear and neat without gaps, which is conducive to tightening5. Versatile and practical: Self drilling screws are widely used in household and office appliances, workplace fasteners, electrical products, communication equipment, ship assembly, machinery, furniture, repair work, DIYspecification:Item type: self drilling screwMaterial: galvanized carbon steelSurface treatment: galvanizedProduct specification: M4.2x38mmPackage list:250 x self drilling screwNote:Pay attention to the correct operation.