ProTool Classic 5" Tungsten Carbide Wheel Glass Cutter The classic glass cutting tool still favored for it's simple effectiveness 5mm tungsten carbide wheel precision ground to V-section for accurate scoring of glass surface Notched head for snapping scored glass; sized for glass 3, 4 and 5mm-thick Tapping ball on handle end to help separate panes; use with non-tempered plate glass Heavy-weight die-cast aluminum handle with durable enamel finish, 5" length;