Abstract: An improved machine tool assembly for use with sizing and shaping machines comprising a translating body, a stationary body, and an interconnecting structure is provided. The translating body can be provided in the form of a mandrel or jaw assembly while the stationary body, which cooperates with the translating body to deform a work piece, can be provided in the form of a ring or a housing assembly having a plurality of radially movable fingers. The interconnecting structure joins the translating body and the stationary body so that the same can be removed from the sizing machine as a single unit. The interconnecting structure also has an axial, angular, and/or radial alignment member(s) which maintain the relative alignment between the translating body and the stationary body during installation and/or removal of the machine tool assembly from a sizing machine.