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The tool in your image is an Oumers chain whip, which is used to hold a bicycle cassette (the gears on the rear wheel) in place so you can remove the lockring. Because the cassette freehub only spins in one direction, you need this tool to "lock" it while you use a separate lockring tool to loosen it.How to Use Your Chain WhipTo remove a cassette, follow these steps:Position the Wheel: Place your rear wheel on a stable surface with the cassette facing up.Attach the Chain Whip: Wrap the loose section of chain around one of the larger cogs on your cassette. Ensure several links are securely engaged to prevent slipping.Insert the Lockring Tool: Place your cassette lockring removal tool into the splines of the lockring at the center of the cassette.Apply Leverage: Hold the chain whip handle firmly with one hand to keep the cassette from rotating. Use your other hand with a wrench on the lockring tool to turn it counter-clockwise to loosen it.Remove the Cassette: Once the lockring is off, you can slide the cogs off the freehub body.