I got these because I needed to install a new High Pro intake manifold on my rebuilt engine. It's always a good idea to replace all inlet bolts with every replacement because, as you'll find out the hard way, most aftermarket standard bolts just don't work. The included EZ tool is handy because you can always retighten the bolts after the engine has started and the gaskets have been installed. And for the price, you just can't go wrong.