This bottom plate includes counter-sunk holes for the stack screws. I didn’t like this design at first. After flying the Raven PRO, and crashing it, I grew to greatly appreciate the 9 millimeters in thickness of carbon fiber and 12.9 steel at the core. This bottom plate is an essential component of the Raven PRO’s 9mm-thick carbon sandwich. You will NEVER experience core plate failure with this design!