SHOCK ZONE™ Geometry - designed to flex: Designed for use with impact drivers the SHOCKWAVE™ IMPACT DUTY accessory line is not only ideal for heavy duty impact applications, but also delivers a full system solution for all the user's drilling and fastening needs. Laser hardened WEAR GUARD TIP™ for improved wear resistance and protection of the fit over the life of the bit. SHOCK ZONE™ reduces stress at the tip resulting in less tip breakages. The combination of the SHOCK ZONE™ design and special heat treatment absorbs impacts and allows the bit to flex with spring like action. Custom engineered steel - Milwaukee custom metal formula makes the SHOCKWAVE™ bits more resistant to shock from impacting.