The LOCK WASHER INTERNAL ZINC 5/16" INTERNAL TOOTHED is designed to ensure a strong grip and prevent loosening under vibration. Crafted from high-quality spring steel, this washer features inwardly extending prongs that secure the connection while remaining hidden beneath the screw head for a polished appearance. Ideal for applications where aesthetics and reliability are essential, this washer is suitable for various automotive and industrial uses. Its zinc coating offers added corrosion resistance for extended durability.