Due to its traditional quality, the Unior trademark is popular with both professional and amateur craftsmen. A century of excellence for the next millennium Unior, the European hand tools producer, is a synonym for reliable, high-quality, and functionally designed hand tools around the world. - Useful for touring or emergencies that require gear-cluster to be removed - Also useful for replacing or fixing spokes on the go - To use: Remove wheel, fit tool on cassette nut, replace wheel in bike - Ensure tool edge presses on frame or hanger, push on pedals to loosen nut - European made and lifetime warranty