2250-Piece Multi-Specification Set: Includes 910 metric bolts (M3, M4, M5, M6, M8) and SAE bolts (#4, #6, #8, #10, #1/4, #3/8, #5/16, #6-32, #8-32, #10-24, #1/4-20, #5/16-18, #3/8-16). Perfect for repairs and replacements Sturdy Alloy Steel Material: Made from high-quality alloy steel, offering long-lasting durability and stability. The galvanized finish improves corrosion resistance, ensuring the bolts and nuts remain rust-free and perform well under various conditions Precision Manufacturing: Each component is precisely machined to U.S. Grade 5 and Metric Grade 4.8 standards. With a 48-hour salt spray test, these bolts and nuts provide reliable fastening and wont loosen or degrade over time Quick Part Identification: Comes with 3 adjustable transparent storage boxes