Ultrapure Linkage, Lever, and Key Oil is used for mechanical linkages of rotary valves, ball joints, levers, keys, triggers, etc. It is excellent on all threaded parts, such as valve cap threads and threaded bells. Also use it as a wind instrument key oil for clarinet, saxophone, flute, oboe, bassoon, etc. Because it is a thicker oil, it will last a long time and protect metal-to-metal joints.