• 240-piece assorted set including bolts, hex nuts, flat washers, and lock washers. • Made of high-strength grade 8 carbon steel with a black zinc finish. • Offers excellent corrosion resistance, anti-rust properties, and high hardness for use in extreme environments. • Includes 12 different sizes with coarse thread measurements 1/4-20, 5/16-18, and 3/8-16. • Washers are designed to disperse loads and prevent loosening in industrial, automotive, and domestic applications. • Smooth, burr-free precision threads for efficient installation.