The “Hammer Rite” is simply a way of establishing ritual space. This space is not as distinct as what one finds in traditional wiccan circles. Rather, the Hammer Rite is more of a calling to indicate to ourselves, and to the gods, that we’re about to perform a ritual. Some have described it as a “ringing of the bell.”
When one performs a hammer rite, one doesn’t create an inside and outside, or even a “ritual geometric shape.” The purpose of a Hammer Rite is to establish that a given “space” is being used for ritual. It’s the recognition that we’re calling upon the gods and goddesses to be with us, as we exercise our will upon the universe.