Abstract: A device to be attached to drills, particularly power drills, for indicating the angular relation of the rotational axis of the drill to a surface being drilled and permitting the drill operator to guide the drill in accurately pointing the axis of the drill bit at any angle up to about 45.degree. out of square, or plumb to about 45.degree. out of plumb, or any combination thereof. Furthermore, the device can be utilized as an angle drilling gauge independently of its attachment to a drill in order to determine the angle between two planar surfaces joined at an angle from square to about 45.degree. right or 45.degree. left out of square.