Ok, so most of know, that a press/mallet/hammer is the incorrect way to install a crank. And its also the incorrect way to remove a crank. Cranks are not designed to see the forces, that are created when using improper tools. Don't risk damaging bearings/cranks/bores by using improper tools. If your going through the work to install a crank, do it right. This puller tool, pulls the new crank into the cases, and the pusher tool pushes the crank out of each case half. This is a super, easy, painless process. This is a complete kit.