There are countless reasons to need a reliable "rust buster." Engine work, construction, maintenance, demolition, etc. Penetro 90® is a high performance penetrating oil that penetrates and lubricates all types of moving parts that have become difficult to operate due to increased friction from wear, corrosion or the buildup of sludge and grime. Blended from a unique patented formula with the following benefits. 1)Superior rust busting characteristics. 2)Prevents thread stripping. 3)Triples the life of hoist chains. 4)Triples the time between applications. Uses: Valves - Gears - Linkage - Conveyors - Rollers - Taps & Dies - Hoist Chains - Hinges - Control Cables - Locks - Electric Power Tools - Air Power Tools - Cutting Tools.