Although locks are listed on the label uses, use with extreme caution. We lubed 4 lock sets which were only a bit less than smoothly operating to begin with and only one is now operable. All others are blocked / frozen in place. We have followed instructions to break the blockage to no avail. Will probably have to replace all locks. Thank goodness we "worked" one of the locksets extensively after lubing it or we would be locked out. WORST GRAPHITE PRODUCT EVER FOR LOCKS.