The 2312 Motor for Phantom 3 Professional / Advanced with counterclockwise threading (CCW) is for propellers that use the same rotational direction. The quadcopter has four motors total, two clockwise (CW) and two counter-clockwise (CCW). It is important to replace the motor with one of the same thread orientation to ensure the props do not come loose during flight.
These motors will only work with Phantom 3 Professional/Advanced models that have the first-generation central board (Part 33). They will not work with the newer central board (Part 96). Additionally, they will not work with the Phantom 3 Standard.