Self-Drilling Screws With Truss Head: High-Quality Steel With Zinc Or Galvanized Coating Self-Drilling Thread For Easy Screwing Into Various Materials Sharp Point For Easy Penetration Self-Drilling Thread: Allows For Easy Screwing Into Various Materials Without Pre-Drilling. Provides A Large Bearing Surface For Added Strength And Stability. Facilitates Easy Penetration Into Materials. Made From High-Quality Steel For Long-Lasting Performance.