Bi-metal Irwin blades stay sharp three times longer than ordinary blades and are unbreakable under normal working conditions. Smooth, durable, three-position slide exposes variable blade lengths and stands up to frequent use. Optimized cutting angle for reduced hand fatigue. Push-button offers easy access to interior blade storage. The economical choice for light-duty cutting jobs. Fully retractable blade for safety. Each cutter includes one blade. 12 cutters per box.. . .