Anaerobic thread locker, from 6 to 20 mm. Blue - medium adhesion. 6 ml. Improved replacement for spring washers. It bonds metal surfaces together when there is not oxygen supply to them after the installation. It retains, seals, and protects the thread from corrosion. It is widely used in the industry and household. It is certified for use by GM, Mercedes, BMW, Ford car manufacturers. Application: Apply on the middle part of the thread and assemble the parts. To speed up the process in low temperatures and for non-active surfaces, use Permatex 24163 aerosol primer-activator.