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, This is a super, easy, painless process.
Choose the puller, OR the pusher. the pusher is to remove your crank without damaging it. The tool with the 3 big arms is the pusher tool