This paper examines gaze gestures and their applicability as a generic selection method for gaze-only controlled interfaces. The method explored here is the Single Gaze Gesture (SGG), i.e. gestures consisting of a single point-to-point eye movement. Horizontal and vertical, long and short SGGs were evaluated on two eye tracking devices (Tobii/QuickGlance (QG)). The main findings show that there is a significant difference in selection times between long and short SGGs, between vertical and horizontal selections, as well as between the different tracking systems.