Abstract: A hand-operated tool for cutting sheet glass; the tool including a flat plate which near one end supports a rotatable circular cutter blade for scribbing a scored line on a glass surface, a spherical knob at an opposite end of the plate serving as a hammerhead to strike at the glass on an opposite side of the scored line so to deepen the cut of the score, and the plate having a series of different width notches along one side edge for grasping one end of the glass and breaking it off about the scored line; the plate additionally including a storage compartment inside for storing extra circular cutter blades.