Thread nominal (M): Purpose: Standard Nail type: screw Head form: cylindrical head Standard: No. null: Material: stainless steel A1-50 Specification model: A2310 Strength grade: Grade A Surface Treatment: galvanized [Combination] 900 boxed stainless steel 304,M3,M4,M5 semicircle head/flat round head hexagon socket head cap screw nut spanner set BASIC INFO 1. Product material: 304 stainless steel 2. Surface treatment: washing and brightening 3. Standard type: German standard 4 product categories: bolts, nuts, gaskets Product specifications: M3, M4, M5, Product Accessories: Allen wrench Scope of Application: automobile industry-cars, trucks, buses, construction machinery, wind power generation Preparation, agricultural machinery, casting industry, drilling equipment, shipbuilding industry, mining Equipment, public facilities, rail transit, Product function: it is a part that tightly connects mechanical equipment and so on. Gasket, It increases the contact area, reduces the pressure, prevents loosening, and protects Parts and screws