Kroil Penetrating Oil `` icy '' metal parts strong-minded rusted hardware is no match for Kroil Penetrating Oil ! . It 's the best to `` unfreeze '' strong-minded rusted hardware and fasteners. Quickly rusted nuts and bolts Frees icy shafts, pulleys, etc.. Dissolves rust, , cleans and prevents incoming rust Penetrates spaces as character as 1-millionth of an inch .