Necessary tool for removing that stubborn main crankshaft bolt in order to service the timing belt and water pump. That sucker was torqued on so hard that I didn't think this tool would work, but knowing the direction of engine rotation of my Honda Pilot and resting this tool firmly against the subframe of the car with the appropriate socket/extension (and standing clear of the wheel well!), I clicked over the engine momentarily to the sound of a loud bang (the release of the bolt's tension). This broke the bolt free on the crank and then the rest of the repair went easily. The tool is so sturdy it showed no signs of going through such a traumatic event, and no injury to my hands. Note that I tried the pry bar method but the engine kept turning, so this was my solution. I think this is a great product.