• Manufactured with a carbon steel outer ring and a rubber inner ring to ensure a long service life. • Heat-resistant, wear-resistant, corrosion-resistant, acid-resistant, and aging-resistant material without deformation. • The inner rubber ring provides a double sealing effect that ensures greater tightness in the connection parts. • The kit includes a total of 180 pieces distributed across 10 sizes: M6, M8, M10, M12, M14, M16, M18, M20, M22, and M24. • Suitable for automotive drain plugs, sealing under screw heads, and hydraulic or pneumatic connections. • Versatile application in industrial machinery, valve bodies, pipes, cylinders, pumps, and household appliances. • The set comes in a labeled storage box that facilitates organization and identification of each size.