【HIGH QUALITY MATERIAL】Hex Button Head Socket Cap Screws Nuts Washers Assortment Kit Made of High Quality 304 Stainless Steel, m3 m4 m5 screws which Features is Strength and Offers Good Corrosion Resistance in Bad Environment and High Humidity Areas. 【VARIOUS SIZES】500PCS screw sets included M3 M4 M5 Screws Nuts Washers and Allen Wrench Drives. Screws and Bolts Conform to the Standardized Metric System, with an Error Less than 0.01mm. Compact and Force Uniform Screw Thread is Not Easy to Out of Shape and Slid in the Process of Rolling and Installation. 【WIDE APPLICATIONS】This Button Head Socket Screws Kit Serves a Wide Range of Use and for Professionals, Amateurs, Landlords, Repairmen, other DIY Users; Screws kit has Fifteen Different Sizes, which Can Meet the Maximum of Requirement for you. 【SAFETY & ECO-FRIENDLY】M3 M4 M5 Screws and Nuts Adopt High Quality 304 Stainless Steel Material, which is Environmental Protection and Mercury-free & Toxic-free. No Toxic Substances Releasing, which will Ensure your Safety. They have Superior Rust Resistance and the Excellent of Oxidation Resistance, which Can Ensure Long Time Using. 【HANDY BOX】This Set is Organized by a Durable and Sturdy Case, which is Easy to Get the Bolts you Need and Convenient to Put Off your Tiny Parts.