Made with a polygon design, the self-sharpening polygon chisels make resharpening and rehardening unnecessary, allowing consistent performance throughout the chisel’s life. The 11/8-in. polygon chisel also increases the working length of flat and wide-flat chisels by 100%, allowing for deeper penetration. The innovative design also helps prevent the chisel from jamming in the base material. This reduces jobsite interruptions and the risk of tool damage. Hilti. 800-879-8000.