This Item is a Harmonic balancer installation tool that is used to press the harmonic balancer back onto the crankshaft.  This can be used on models with 4.2 liter engines that are listed in the compatibility chart. The models that are compatible are 02-09 GMC Trail blazer, 02-09 Chevy Envoy, 05-09 Saab 9-7X, 03-08 Isuzu Ascender, 04-07 Buick Rainier.  This will only work on the 4.2 Liter engine models.

  Using the original bolt to press the harmonic balancer back on is a really bad idea.  Dont do it. When using the original bolt the stress is on only a few threads which can lead you to ruin your crankshaft threads.  When using this tool you simply thread the tool into the crankshaft, slide the washers on, use a deep well socket and then turn the nut to press the harmonic balancer back on to the crankshaft.  All of the stress is on all of the threads of the crankshaft instead of just a few that you would have by using a bolt to press it on. Remove tool and install and torque original bolt. This is a simple tool that you can use over and over again and works awesome. I have sold hundreds of these with superior results, so buy with confidence, and this tool is alot cheaper than the same $90 tool GM sells. 

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