Premium 304 Stainless Steel Construction：Crafted from high-quality 304 stainless steel (18-8), these flat head hex socket cap screws offer exceptional strength and corrosion resistance. Perfect for both indoor and outdoor use, they outperform ordinary steel and carbon steel fasteners, ensuring long-lasting durability in harsh environments Precision Design for Maximum Efficiency :Featuring a flat head hex socket design, these screws provide superior torque without slippage, making installation quick and easy. The hex drive size of 0.53 inches ensures a secure fit, while the full-thread design enhances grip and stability for a variety of applications Complete Kit for Convenience：Each package includes 10 pieces of 5/16-18 x 3" flat head hex socket cap screws, 1 hex spanner, and a transparent storage boxfor easy organization. Whether you're a professional or a DIY enthusiast, this all-in-one kit has everything you need to get the job done right Versatile Applications for Home & Industry：Ideal for assembling beds, cots, flat-pack furniture, office appliances, and machinery, these screws are also perfect for shipbuilding and various DIY projects. Their reliable performance makes them a must-have for both household repairs and industrial use Satisfaction Guaranteed with Exceptional Support：We stand behind the quality of our products. If you have any questions or concerns, our dedicated customer service team is here to help. Contact us anytime, and we’ll provide a professional response within 24 hours. Your satisfaction is our top priority Product Title: 304 Stainless Steel Hex Socket Screws 18-8 Bolts- 1/4" & 5/16" Corrosion Resistant(with Hex Spanner) Description: Industrial-grade 304 stainless steel flat head hex socket head cap screws for high-stress applications. Three diameters: 1/4" (6.35mm) & 5/16" (7.94mm) & 3/16" (5.72mm) with Fully Machine Thread. Key Features: ✓ 304 Stainless Steel ✓ temperature resistanc ✓ Grade A hardness | 100,000 PSI tensile strength ✓ ±0.02mm hex socket precision ✓ anti-loosening design Applications: Automotive/Engine Parts Marine/Solar Installations Industrial Machinery Furniture/DIY Projects Packaging: 10/20/25/30/40/50pcs