note these are stainless steel .high quality 

The oxygen sensor connector M18 x 1.5 is made of high-quality stainless steel . It has the functions of crack resistance, corrosion resistance .

Long service life: It can be used repeatedly, has high rust resistance in extreme environments, and the oxygen sensor will not deform over time.

Easy to install: fast and easy to install, the thread made with special tools will fit all M18 x 1.5 sensors, that is, various car models.