Abstract: The invention relates generally to rotary drilling equipment, and more particularly to stabilizers which are specifically adapted for use during directional drilling when only the drill bit is rotated using a down-hole motor, but which are also well suited for use during conventional drilling when the entire drill string is rotated. In a preferred embodiment, this is achieved by using three longitudinal ribs on the stabilizer body, one of which is displaced laterally in a down-hole direction and is radially oriented such that it contacts the low side of the borehole during directional drilling.