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. With blade lock. Blade remains rigid up to seven feet. Chrome case, belt clip. 1 wide x 25-ft.". . .