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What is this tool for?

Anyone know what this tool is used for?

Picture of What is this tool for?
See this web page it is a small engine valve spring compressor.

http://www.mytoolstore.com/kd/kdengi13.html
Valve spring compressor.

When you are doing a valve job on a motor you compress the valve spring to remove the locking clip to take out the spring assembly.

After that you can grind or replace the valve and valve seat.