The Grease Joint Cleaner Tool quickly opens plugged grease fitings and joints. It dissolves and removes these blockages by injecting penetrating oil into the grease joint, through the standard grease fitting. Easy to use, the tapping action flushes out the passageways and relief slots allowing for new grease to be applied. Forget about heating up or dissassembling joints. This is a great tool for every machinery maintenence or service mechanic. The Grease Joint Cleaner Tool Pocket Model includes a pocket clip and tip cover.