Features 1、High Strength: Spot welding screws have high strength and good corrosion resistance in harsh environments such as high temperature, cold and high humidity. 2、6 Types: This stud machinery screw kit has 325 screws with 6 different types, M3 M4, the number meets the needs of daily use. 3、Storage Box Design: This stud machine screw kit comes with a storage box to keep all kinds of screws separate to prevent loss. 4、Rust and Oxidation Resistance: The stud machinery screws have excellent rust resistance and excellent oxidation resistance. 5、Wide Range of Uses: High strength spot weld screws are suitable for repair, home improvement, DIY, etc. You will love this electric welding screws when you are repairing in your garage. Specification Item Type: Spot Welding Screws Material: 304 Stainless Steel Package List 60 x M3x6 Screws 60 x M3x8 Screws 60 x M3x10 Screws 60 x M3x12 Screws 25 x M3x16 Screws 60 x M4x6 Screws 1 x Storage Box