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;