Polytron Penetrating Lubricant contains Polytron MTC and is scientifically blended to be the most effective whenever rust corrosion or drag is a factor. It's highly recommended for general machine shop work like drilling and tapping. Polytron PL is not only penetrates through extreme rust and corrosion, it also treats the metal surface to reduce friction and wear. Use of this product provides for long lasting, smooth operation of any metal mechanism.