1 Step BIO Mil-Spec CLP is a bio formula highly penetrating fluid specifically designed to clean, lubricate and protect your firearms and weapon systems. Based on the highest quality synthetic oil and containing anti-corrosion and anti-wear additives, it has been formulated to keep small and large caliber weapons combat-ready in the harshest of environments (desert, snow, tropical, saline, etc.). 1 Step BIO Mil-Spec CLP performs in temperatures ranging from -51C to +71C (according to the US Mil specification) and withstands temperatures from -54C up to +150C.