New modern three key (milling embryo) to send key chain New modern three key (right slot embryo) to send key chain New modern four key (milling embryo) to send key chain New modern four key (right slot embryo) to send key chain New modern three key tooth milling embryo + within) to send key chain New modern three key (right slot embryo + add tooth) to send key chain Within the new modern four key (milling embryo + hobbing) to send key chain