This flywheel locking tool is not worth the investment. Thanks to my knowledge gained in practice, I found that this tool didn't quite fit into the necessary space needed for an engine .The design was way off and it ended up damaging the flywheel. The instructions were vague and didn't give much insight, which made it tough to figure out how to actually use the product. The only pro is that it came with a decent price point. dON'T buy it..