1. Parts that are tightly connected to mechanical equipment, etc. The gasket is used to increase the contact area, reduce the pressure, prevent loosening, and protect parts and screws. 2. Scope of application: automotive industry - cars, trucks, passenger cars, construction machinery, wind power equipment, agricultural machinery, foundry industry, drilling equipment, shipbuilding industry, mining equipment, utilities, rail transit. 3. Surface treatment: wash bright 4. Standard type: German standard 5. Product specifications: M6 X 8mm-10PCS M6 X 12mm-10PCSC M6 X 16mm-10PCS M6 X 20mm-10PCS M6 Hex Nut-45PCS M6 washer-45PCS M5 X 8mm-10PCS M5 X 12mm-10PCSC M5 X 16mm-10PCS M5 X 20mm-10PCS M5 Hex Nut-45PCS M5 washer-45PCS M4 X 8mm-10PCS M4 X 12mm-10PCSC M4 X 16mm-10PCS M4 X 20mm-10PCS M4 Hex Nut-45PCS M4 washer-45PCS M3 X 8mm-10PCS M3 X 12mm-10PCSC M3 X 16mm-10PCS M3 X 20mm-10PCS M3 Hex Nut-45PCS M3 washer-45PCS